Geology Midterm Questions

The Earth’s crust can be divided into how many distinct types?

2

Which is the largest/thickest layer of Earth?

the mantle

Convection occurring in Earth’s ____ drives the process of plate tectonics

mantle

Earth’s magnetic field is emitted from which layer?

outer core

Seismic waves travel straight through the Earth, true or false?

false

Earth’s layers formed through the process of:

Differentiation

What was the last supercontinent to have formed on Earth ≈ 320 million years ago?

Pangea

Earth’s magnetic poles have changed numerous times, true or false?

true

There are how many different types of primary tectonic plate margins?

3

At mid ocean ridges, rock is

formed

At ocean trenches, rock is

recycled

The invention of ___during the world wars lead to the discovery of bathymetric features

sonar

Alfred Wegener provided evidence supporting his idea of 

Continental Drift

The submarine process of seafloor _____has been called the “missing link” for continental drift

spreading

The age of rock under the seafloor is _____near the modern coastlines.

older

Earth is unique because it has which of the following

active plate tectonics

The continental margins of Florida are ____.

passive