1. Mid-Ocean Ridgesmowerscience.org/ewExternalFiles/Modern Theory Student...1. Mid-Ocean Ridges...

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Modern Theory of Plate Tectonics Modern Theory • The Modern Theory of Plate Tectonics is built on Alfred Wegener’s theory of Continental Drift. • Two new discoveries (discoveries over the last 60 years) helped scientists develop the modern theory of Plate Tectonics. 1. Mid-Ocean Ridges 1. Mid-Ocean Ridges • What is it? • A large mountain range at the bottom of an ocean.

Transcript of 1. Mid-Ocean Ridgesmowerscience.org/ewExternalFiles/Modern Theory Student...1. Mid-Ocean Ridges...

Page 1: 1. Mid-Ocean Ridgesmowerscience.org/ewExternalFiles/Modern Theory Student...1. Mid-Ocean Ridges •How Do We Know? •We know about Mid-Ocean Ridges because of Marie Tharp and her

Modern Theory of Plate Tectonics

Modern Theory

• The Modern Theory of Plate Tectonics is built on Alfred Wegener’s theory of Continental Drift. • Two new discoveries (discoveries over the last 60 years) helped scientists develop the modern theory of Plate Tectonics.

1. Mid-Ocean Ridges

1. Mid-Ocean Ridges

•What is it? •A large mountain range at the bottom of an ocean.

Page 2: 1. Mid-Ocean Ridgesmowerscience.org/ewExternalFiles/Modern Theory Student...1. Mid-Ocean Ridges •How Do We Know? •We know about Mid-Ocean Ridges because of Marie Tharp and her

1. Mid-Ocean Ridges•How Do We Know? •We know about Mid-Ocean Ridges because of Marie Tharp and her analysis of sea-floor data! She first detected the ridge in 1952.

Marie Tharp

Marie Tharp’s Map

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Mid-Atlantic Ridge

Sonar imaging was the technology used to discover the Mid-Atlantic Ridge.

Mid-Atlantic Ridge

Discover more about Sonar Mapping by visiting this website. Write a summary of how sonar is used to map the seafloor

https://goo.gl/YuyH5C

Mid-Atlantic Ridge

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Mid-Atlantic Ridge

Iceland sits on the Mid-Atlantic Ridge. The magma from the ridge, combined with a hot spot beneath the island, pushed the land above the ocean’s surface.

Mid-Atlantic Ridge

Describe the movement of magma under a Mid-Ocean ridge.

Mantle

Mid-Ocean Ridge

Ocean Floor

2. Ocean Trenches

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2. Oceanic Trenches

The location where the

Earth’s crust is pulled back into

the mantle (subduction

zone) The North American Plate is being pulled

under the Caribbean Plate

Caribbean Plate

The North American Plate

Deepest place on Earth

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Mantle

Mid-Ocean Ridge

Ocean Floor

Trench Trench

Stop and CheckWhere is the mid-ocean ridge?

Stop and CheckWhere are the oceanic trenches?

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Stop and CheckAt which location is the temperature highest?

AB C D

The End

Matching

Youngest Crust

Ridge

Matching

Oldest Crust

Trench

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Matching

Coldest

Trench

Matching

Warmest

Ridge

Matching

Thinnest

Ridge

Matching

Thickest

Trench

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The End

Stop and CheckAt which point is the crust the most thick?

AB C D


Mid-Ocean Ridges Mid-ocean ridges are an undersea mountain chain where new ocean floor is produced. In the mid-1900’s, scientists begin mapping the mid-

Mid-Ocean Ridges Mid-ocean ridges are an undersea mountain chain where new ocean floor is produced. In the mid-1900’s, scientists begin mapping the mid-

Primary magmas at mid-ocean ridges, “hotspots,” and other ...3/P^3Chapters/GreenP^3.pdf · Primary magmas at mid-ocean ridges, “hotspots,” and other intraplate settings: Constraints

Primary magmas at mid-ocean ridges, “hotspots,” and other ...3/P^3Chapters/GreenP^3.pdf · Primary magmas at mid-ocean ridges, “hotspots,” and other intraplate settings: Constraints

Cooling and accretion of the lower oceanic crust at fast-spreading mid-ocean ridges

Cooling and accretion of the lower oceanic crust at fast-spreading mid-ocean ridges

Volcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading … · 2002-06-28 · Volcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading

Volcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading … · 2002-06-28 · Volcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading

Mid Ocean Ridges Thermal Evolution Joel Pierson, Glynis Jehle

Mid Ocean Ridges Thermal Evolution Joel Pierson, Glynis Jehle

Rockwall Independent School District · Web viewup between divergent oceanic plates creating ridges, new crust and seafloor spreading b. mid-ocean ridges created by O-O divergence

Rockwall Independent School District · Web viewup between divergent oceanic plates creating ridges, new crust and seafloor spreading b. mid-ocean ridges created by O-O divergence

HDWK Mid Ocean Ridges –Detected a long time ago Molten Material (go look! Pillow Lava!) Magnetic Stripes Drilling Samples Subduction and Deep Ocean Trenches.

HDWK Mid Ocean Ridges –Detected a long time ago Molten Material (go look! Pillow Lava!) Magnetic Stripes Drilling Samples Subduction and Deep Ocean Trenches.

MID-OCEAN RIDGES: MANTLE CONVECTION AND FORMATION …€¦ · MID-OCEAN RIDGES: MANTLE CONVECTION AND FORMATION OF THE LITHOSPHERE G. Ito and R. A. Dunn, University of Hawai’i at

MID-OCEAN RIDGES: MANTLE CONVECTION AND FORMATION …€¦ · MID-OCEAN RIDGES: MANTLE CONVECTION AND FORMATION OF THE LITHOSPHERE G. Ito and R. A. Dunn, University of Hawai’i at

Magnetic Anomalies and Mid-Ocean Ridges

Magnetic Anomalies and Mid-Ocean Ridges

The Structure of Mid-Ocean Ridges

The Structure of Mid-Ocean Ridges

Week 2 - Ocean Ridge VolcanismOcean Ridge Slow spreading ridges like the Mid-Atlantic Ridge can have vertical relief of up to a 1000m at the axial valley. Fast-Spreading Mid-Ocean

Week 2 - Ocean Ridge VolcanismOcean Ridge Slow spreading ridges like the Mid-Atlantic Ridge can have vertical relief of up to a 1000m at the axial valley. Fast-Spreading Mid-Ocean

Chapter 3faculty.fiu.edu/~srimal/oceanbasin.pdf · Mid-Oceanic Ridges 1.These are the most conspicuous features of the ocean basins. 2.The mid-ocean ridge is a continuous chain of

Chapter 3faculty.fiu.edu/~srimal/oceanbasin.pdf · Mid-Oceanic Ridges 1.These are the most conspicuous features of the ocean basins. 2.The mid-ocean ridge is a continuous chain of

Objectives - Mrs. Richmond's Earth Science Pagerichmondsciencelikeaboss.weebly.com/uploads/5/9/5/...Mid-Ocean Ridges The Seafloor –Mid-ocean ridges are chains of underwater mountains

Objectives - Mrs. Richmond's Earth Science Pagerichmondsciencelikeaboss.weebly.com/uploads/5/9/5/...Mid-Ocean Ridges The Seafloor –Mid-ocean ridges are chains of underwater mountains

Lecture 2a: Igneous classification, mid-ocean ridges Questions –How many igneous rock names should you learn, and what do they mean? –What is a mid-ocean.

Lecture 2a: Igneous classification, mid-ocean ridges Questions –How many igneous rock names should you learn, and what do they mean? –What is a mid-ocean.

· PDF fileHow is molten material evidence of seafloor spreading? ... YOUNGEST near the mid- ocean ridges. The farther from the mid- ocean ridge, the older the oceanic crust is

· PDF fileHow is molten material evidence of seafloor spreading? ... YOUNGEST near the mid- ocean ridges. The farther from the mid- ocean ridge, the older the oceanic crust is

Plate Tectonics II. Modern discoveries supporting Plate Tectonic Theory Symmetry of magnetic polarity across mid-ocean ridges Mid-ocean ridges – underwater.

Plate Tectonics II. Modern discoveries supporting Plate Tectonic Theory Symmetry of magnetic polarity across mid-ocean ridges Mid-ocean ridges – underwater.

Mid-Ocean Ridges

Mid-Ocean Ridges

Deep Ocean Topography Mid-Ocean Ridges and Hydrothermal Vents Sarah Fawcett.

Deep Ocean Topography Mid-Ocean Ridges and Hydrothermal Vents Sarah Fawcett.

Evidence for Plate Tectonics Shape of Continents Rock Types Fossils Glaciers Mountain Chains Location of Earthquakes Mid-ocean ridges and ocean floor rock.

Evidence for Plate Tectonics Shape of Continents Rock Types Fossils Glaciers Mountain Chains Location of Earthquakes Mid-ocean ridges and ocean floor rock.

You may wonder… Why are the continents moving?. Seafloor Spreading The oceans are widening along the mid- ocean ridges.

You may wonder… Why are the continents moving?. Seafloor Spreading The oceans are widening along the mid- ocean ridges.