sea floor spreads 10 cm per year

OC/GEO 103 Lab 2 - Oregon State University

17 Oct 1999 ... Gain familiarity with seafloor topography, particularly in the Pacific ... of years) produces large plates of oceanic lithosphere that floor entire ocean basins. ... Pacific Rise is a FAST-spreading ridge (10 cm/yr or greater, full rate).【Get Price】

Making Oceans and Continents

Seafloor spreading hypothesis was proposed by Harry Hess in the early ... LAGEOS and GPS satellites determine that plates move 1-10 cm per year, avg 5.【Get Price】

An Expedition to the Seafloor - Student Guide Using Google ...

the past three years. 2. ... An Expedition to the Seafloor to Investigate Seafloor Spreading — Student ... 10. Notice the color line going down the center of your data points. This is the ... Now, convert the spreading rate into centimeters per year.【Get Price】

Plate tectonics - Seafloor spreading | Britannica

Seafloor-spreading rates are much more rapid in the Pacific Ocean than in the Atlantic ... At spreading rates of about 15 cm (6 inches) per year, the entire crust beneath ... Between 10 and 20 percent of the subduction zones that dominate the...【Get Price】

How to Calculate the Rate of Sea Floor Spreading - Sciencing

24 Apr 2017 ... ... determined in centimeters per year. To calculate the rate of the spreading, you need to use the following formula: the distance the sea floor...【Get Price】

18.2 The Geology of the Oceanic Crust – Physical Geology

This magma oozes out onto the sea floor to form pillow basalts (Figure 18.1), ... Earth's magnetic field reversal chronology for the past few hundred million years. ... are obvious differences in the rate of sea-floor spreading along different ridges. ... (approaching 10 cm/y on each side in some areas), while those in the Atlantic...【Get Price】

Sea Floor Spreading The map above shows part of the North ...

Sea Floor Spreading ... Select one strip of sea floor basalt between points A and B. Record the ... distance/time = velocity in cm per year ... Africa increased since you were born? 10. How much closer (in metres) were these two continents when.【Get Price】

Seafloor spreading | SpringerLink

It postulates that new ocean floor is constantly being created about mid-ocean ridge crests at a rate of a few centimeters per year per ridge flank (i.e., tens of...【Get Price】

Plate Tectonics: 2.3.1 Linear magnetic anomalies - a record of ...

Surprisingly, results showed that the basaltic sea floor has a striped magnetic ... Since sea-floor spreading is a continuous process on a geological timescale, the ... The Open University has 50 years' experience delivering flexible learning and...【Get Price】

Harry Hess: One of the Discoverers of Seafloor Spreading ...

Within a few years, a curious terrain had emerged: vast, flat plains interrupted by ridges, or more precisely, vast mountain ranges. In the Atlantic Ocean, the “ridge”...【Get Price】

Earth's Climate - Atmospheric and Oceanic Sciences

1-10 cm/yr ==>5000km/100myr. 2.7g/cm3. 3.2g/cm3. >3.7g/cm3. Soft acts as viscous ... Sea floor spreading ... CO2 Change in the last 100 myr: Hypothesis 1 ... seaway as a precursor to east African aridification around 3-4 million years ago.【Get Price】

seafloor spreading | Evidence & Process | Britannica

Seafloor spreading, theory that oceanic crust forms along submarine ... moving away from the Mid-Atlantic Ridge at a rate of 1–2 cm (0.4–0.8 inch) per year, thus...【Get Price】

at subduction zones. 4. Evidence for Sea-floor Spreading. a. Rock sampling at ... tectonic plates. 2. Plates move ______- ______ cm per year. 3. Three types of plate boundaries. a. Divergent- ... Plates move slowly- 0.1 to 10 cm per year. 3.【Get Price】

Ocean-Floor Convergence: A Contrary View of ... - JSTOR

Some sea-floor spreading interpretations may be influenced by the ruling theory, and ... spreading rates of. 4.6 cm per year (Phinney 1968) to 10 cm per year.【Get Price】

Multiple Choice Questions for Plate Tectonics - Chapter 19

about 10 million years ago about 200 million years ago about 570 million years ago. What two scientists proposed the theory of seafloor spreading in he early ... at a rate of 3 cm per year how far (in kilometers) will it spread in a million years?【Get Price】

GalAPAGoS: Where Ridge Meets ... - NOAA Ocean Explorer

Thus the mid-ocean ridge is also known as a "spreading center" or a "divergent plate boundary." The plates spread apart at rates of 1 cm to 20 cm per year.【Get Price】

Seafloor Spreading | National Geographic Society

8 Jun 2015 ... The Mid-Atlantic Ridge, for instance, is a slow spreading center. It spreads 2-5 centimeters (.8-2 inches) every year and forms an ocean trench...【Get Price】

Plate Tectonics

10. Ocean-plate destruction. 11. The Forces Acting on the Plates. 11 ... accommodated by rifting in continental regions, and by seafloor spreading beneath ... centimeters per year across the surface of the Earth and are separated by different...【Get Price】

In 250 million years Earth might only have one continent - BBC

1 Aug 2016 ... They were being pushed around by the upwelling of magma along the mid-ocean ridges. His theory became known as "seafloor spreading".【Get Price】

MiSP Plate Tectonics Worksheet #1 L3

calculate the rate of sea floor spreading. ... chart in the column “distance from mid-Atlantic ridge in cm.” 5. Complete ... sea floor spreading in the past 38 million years: ... 10. Compare the unit rate of change from #9 with your answers to 1 and 2.【Get Price】

Age, spreading rates, and spreading asymmetry of ... - Archimer

interpolation between adjacent seafloor isochrons in the direction of spreading. ... magnetic anomaly data points to 10 at distances of 1000 km and larger. ... causes a downward flow rate of over 2 cm/year at both 410 and 660 km, suggesting...【Get Price】

Early seafloor spreading in the South Atlantic: new evidence ...

14 Apr 2016 ... After their seminal paper, linking seafloor spreading to magnetic data (Vine ... those associated with magnetochrons M0–M10 (Schreckenberger 2001). ... Their model required break-up at 123 Ma with initial seafloor spreading at 2.4 cm a–1. ... From oceanic crust to exhumed mantle: a 40 year (1970–2010)...【Get Price】

Sea Floor Evidence - CliffsNotes

(Measurements indicate that new crust moves away from a ridge at rates from 2 to 10 cm/year.) A midoceanic ridge is called a spreading axis or spreading...【Get Price】


For at least 100 years, scientists have known that a ridge exists in the middle of the ... Hess proposed that new ocean floor was formed by rising magma at the rift of ... of spreading across the ridge was 8000 km/80 my (= 100 km/my or 10 cm/yr).【Get Price】

Age, spreading rates, and spreading asymmetry of the world's ...

3 Apr 2008 ... Ages for ocean floor between the oldest identified magnetic anomalies ... than 1 million years long and errors larger than 10 million years long are ... region causes a downward flow rate of over 2 cm/a at both 410 and 660 km,...【Get Price】

Mid-Atlantic Ridge - The Geological Society

The dates revealed that the Atlantic Ocean was opening by seafloor spreading from the Mid Atlantic Ridge at a rate of about 0.02 metres per year. This means that...【Get Price】

Calculating Sea Floor Spreading - Clark Science Center

... Sea Floor Spreading. Rate of Spreading = distance the sea floor moved / length of time ... cm or 105 cm. 1. For the North Atlantic Ocean (using the map in the lab) ... R = d/t or R = 9.5 * 107 cm / 6.5 * 107 years = 1.46 cm/yr. Notes: Ranges of...【Get Price】

Seafloor spreading - Wikipedia

Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is ... 8 See also; 9 References; 10 External links ... Intermediate ridges have a spreading rate of 40–90 mm/year while slow ... where ρ ∼ 3.3 g ⋅ c m − 3 {\displaystyle \rho \sim 3.3\ \mathrm {g} \cdot \mathrm {cm} ^{-3}} {\displaystyle...【Get Price】

Mid-Oceanic Ridge - AccessScience from McGraw-Hill ...

Some spreading axes are located near the edges of ocean basins and behind island arcs. ... effects of sea-floor spreading (divergent plate motion) and thermal contraction. ... per year (for example, along the northern Mid-Atlantic Ridge; Fig. ... width of a part of the ridge forming where the plates are separating at 10 cm (4 in.)...【Get Price】

G101 Lab 2 Plate Tectonics - Wenatchee Valley College

The theory of seafloor spreading, part of plate tectonics theory, predicts that the ... to centimeters per year (cm/yr), divide the km/Ma number by 10, or multiply by...【Get Price】

Sea Floor Spreading - an overview | ScienceDirect Topics

They computed the spreading rate at slightly less than 2 cm per year of ... km under the continents and 10–50 km under the ocean floor depending on age...【Get Price】

BRIDGE: full text only version - Dr Jon Copley

At the mid-ocean ridges, plates are moving apart at 2-20 centimetres per year, and the ... The ridges in the Atlantic Ocean spread at between 20 and 30 mm/yr ... and representing seafloor up to 10 million years old, with resolution comparable...【Get Price】

A Mechanism for Sea-Floor Spreading - UMass Geosciences

Spreading Rate = Distance (cm)/Age (years) ... Typical spreading rates range from 1 – 10 cm/yr. Distance ... If we drill a series of holes in the ocean floor that are.【Get Price】

Geosc040, Plate Tectonics and Sea Floor Spreading

Initial opening of ocean basin Seafloor spreading and ocean basin widens ... This is followed by subduction along oceanic margins 4. Eventual ... -Frequency of flips: ten thousand--10^4--to tens of millions --10^7 years ... --half rates 1-10 cm/yr【Get Price】

Plate Tectonics | The Canadian Encyclopedia

5 Feb 2012 ... Spreading ridges, or divergent plate boundaries, are places where plates move ... The oldest ocean floor is a little less than 200 million years old and ... and 10 cm per year they cool by conduction at the rock-water interface.【Get Price】

Download The-Race-Is-On-with-Seafloor-Spreading - JOIDES ...

Seafloor spreading is one component of the theory of plate tectonics. ... created at, and subsequently moved away from, ridges is by collecting and ... Cocos plate. Clipperton FZ. 500 km. 100°W. 20°N. 80°W. 10°N. Seafloor ... Using the tables below, calculate the spreading rates in centimeters/year (cm/yr) for the magnetic.【Get Price】


10. 1100. (i) Plot a graph to show the average age of rocks against distance from ... the average rate of sea floor movement over the hot spot in centimetres per year. ... 5 Describe four pieces of evidence for the process of sea floor spreading.【Get Price】

A Model of Sea-Floor Spreading Teacher's Guide

Lithosphere plates are moving at rates of a few cm per year. ... Sea-floor spreading — In the early 1960s, Princeton geologist Harry Hess ... 10) Pull each strip of paper towards the slits nearest the margins of the paper (the subduction zones).【Get Price】

Seafloor spreading structure, geochronology, and tectonic ...

5 Jan 2018 ... Medium- to fine-grained isotropic gabbros are crosscut by brittle normal faults and ductile shear zones (locally 10 cm in width). Sheeted dike...【Get Price】

Sea floor spreading, topography, and the second layer

Slow spreading, away from the ridge center at 1 to 2 centimeters per year, is associated with a thick second layer, a central rift, and adjacent rift mountains. Fast...【Get Price】

Continental Drift - NASA/ADS - Harvard University

THE CONTINENT PROBLEM Continents exist in the crust of the earth, but ... i. e. , mass in grams per square centimeter is equal under continents, mountains, and ... of the clay and ooze average about 1 mm and 10 mm per 1000 years, respectively. ... In the 7 years since ocean-floor spreading was proposed by Hess (1959),...【Get Price】

Lesson 2: Mid-Ocean Ridges

The magma initially collects in a reservoir a few kilometers below the seafloor. ... of the seafloor, adding a thin coat of new lava (typically <10 m thick) with each ... Some spread quite slowly, no more than 1-3 cm per year while others spread at...【Get Price】

Sea-floor spreading rate changes in the South Atlantic ...

A computer correlation technique was used to deduce the spreading history of ... a decrease in rate to 1.7 cm yr-1 relative to the Vine (1966) magnetic reversal model based on the South Pacific. ... C.Jr.: 1970, 'Magnetic Anomalies and Sea Floor Spreading Rates in the ... Over 10 million scientific documents at your fingertips.【Get Price】


putward from large cracks in the ocean floor called spreading centersaThese plates move across the mantle at speeds of up to nearly 10 cm per year and are...【Get Price】

Mid-Ocean Ridges - river, sea, oceans, types, system, Pacific

The mid-ocean ridge system is an example of a divergent (rather than a ... rift valleys, sometimes as wide as 10 to 20 kilometers (6 to 12 miles) and very rugged ... The Mid-Atlantic Ridge moves at an average of 2.5 centimeters (1 inch) per year. ... At slower spreading ridges, the seafloor behaves more like a cold chocolate...【Get Price】

D:\Cdr-Oc\Tsunamis\Textos Tsunamis Web\Ingles\High ...

Changing old ideas about the nature of the earth's crust took many years. ... a. What are mid-ocean ridges, and trenches? b. What is sea-floor spreading? Scientists knew ... centimeters per year. The ... Francisco in 10 million years. On the map...【Get Price】

Pacific Plate Motion - SOEST Hawaii

The floor of the Pacific Ocean is divided into several plates. ... On the surface of the earth, nothing can move along a straight line, instead the ... Around Hawaii, the plate is moving at about 7 cm/year, or about as fast as finger mails grow. ... the San Andreas fault); spreading centers where two plates are moving away from...【Get Price】

Sea-Floor Spreading and Subduction Model

7 Dec 2016 ... The process of sea-floor spreading created the lithosphere under the ... Geologic deformation is usually very slow, measured in centimeters per year, so the ... This works out to 5 cm/y, which is within the 1 to 10 cm/y range that...【Get Price】

4.5: Divergent Plate Boundaries - Geosciences LibreTexts

1 Apr 2020 ... Divergent boundaries are spreading boundaries, where new oceanic crust is created ... This magma oozes out onto the seafloor to form pillow basalts, ... 10 cm/year on each side in some areas), while those in the Atlantic and...【Get Price】

A revised spreading model of the West Philippine Basin ...

4 Aug 2014 ... In the Palau Basin, seafloor fabrics and magnetic lineations trend N-S, ... show a decrease in the spreading rate from 4.4 to 1.8 cm/year since C18n.2n ... mainly in the Palau Basin during the R/V Yokosuka YK10-14 cruise.【Get Price】

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