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Plate Tectonics: An Overview

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Questions and Answers

What was the initial uncertainty about the formation of the underwater ridge system?

The age of the rocks found at the ridge

Whether the ridge was a tectonic plate boundary (correct)

The thickness of sediment near the ridge

Whether the ridge was caused by volcanic activity

What did the thin layers of sediment near the ridge crest and thicker sediment farther away indicate?

Increased erosion farther from the crest

Volcanic activity near the crest

Lack of sedimentation near the crest

Different time periods of existence (correct)

What did the samples taken from the ridge system reveal about the age of rocks near and away from the crest?

Rocks near the crest were very old, getting younger farther away

Uniform age of rocks across the ridge system

Age of rocks did not correlate with distance from the crest

Rocks near the crest were very young, getting older farther away (correct)

What did the theory of seafloor spreading propose?

New oceanic crust is constantly formed due to upwelling magma through diverging tectonic plates Signup and view all the answers

What did the evidence from drilling samples provide strong support for?

The theory of plate tectonics and moving tectonic plates Signup and view all the answers

What is plate tectonics?

The theory that the earth's crust is broken up into plates Signup and view all the answers

What was the purpose of the Deep Sea Drilling Project (DSDP)?

To analyze the ocean floor by drilling core samples Signup and view all the answers

What was the name of the ship used for the Deep Sea Drilling Project (DSDP)?

Glomar Challenger Signup and view all the answers

What important feature is found on the Atlantic Ocean basin?

Mid-Atlantic Ridge Signup and view all the answers

What did the Deep Sea Drilling Project (DSDP) aim to extract from the ocean floor?

Samples of ocean sediments and underlying oceanic crust Signup and view all the answers