Random
What is a device that can detect small changes in magnetic fields?
Magnetometer
What is a trench?
N narrow elongated depression in the sea floor. They can be thousands of km long and many km deep.
The study of history of earths magnetic field.
Paleomagnetism
Earths continents had once been joined as a single landmass that broke apart with the continents moving. And Wegner developed a hypothesis called?
Continental drift
What were the 2 main questions that the scientific community asked Wegener with his continents move theory
What caused plates to move?
How could they move through solid rock?
What is the reflection of sound waves?
Sonar
Is the rock younger or older near the ridges of the rock?
Younger
An imaginary line on a map that shows points that have the same age.
Isochron
The " First Continent", " Supercontinent", existed 200 million hear ago
Pangea
Where were coal deposits found long ago
Antarctica
What formed the longest continues mountain range in the world. Earthquakes and volcanoes are common along this point. They can be more than 65,000 km long and 3 km above ocean floor.
Mountain chains
True or False
Ocean rocks are younger than continental rocks overall.
True
The theory that explains how new oceanic crust forms at ocean ridges, slowly moves away from ocean ridges and is destroyed at deep-sea trenches
Seafloor Spreading
What evidence can be used to support the idea that all the continents used to be all together.
Rock formations evidence, fossil evidence, and climate evidence
Where were glacial deposits found long ago
Africa
What are the types of ocean topography?
Mountain chains, trenches
True or False
Sediment layers were thicker near the ridges and thinner near the trenches
False
It's thinner near the ridges and thicker near the trenches.
What cartographer said the coastlines of the continents appeared to fit together. " Like a puzzle"
Abrahm Ortelius
Indicated that the environment was once wet, warm, and swampy
Cole deposits
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How deep is the Mariana Trench?
More than 11 km deep
What is it called when the flow of the outer core changes, and Earth's magnetic field changes directions.
Magnetic Reversals
What German meteorologist proposed the idea of continental drift in 1912. And he wrote books to support his idea. " The Continents move"
Alfred Wegener
Indicated that the area was once cold enough to support glaciers
Glacial deposits
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