Earth's Layers

The difference between the compositional and mechanical layers of the Earth is:

• Compositional layers are based on density, while mechanical layers are based on pressure

• Compositional layers are based on physical properties, while mechanical layers are based on chemical composition.

• Both layers are based on chemical composition.

• Both layers are based on physical properties.

The compositional layers from deepest to the surface are:

• Crust, Mantle, Outer Core, Inner Core

• Inner Core, Outer Core, Mantle, Crust

• Mantle, Crust, Inner Core, Outer Core

• Outer Core, Inner Core, Mantle, Crust

The Earth's layers are layered because of their densities. Which of the following statements best explains this phenomenon?

• The densest materials are found at the core, while the least dense are at the surface.

• The least dense materials are found at the core, while the densest are at the surface.

• All layers have the same density, which is why they are layered.

• The Earth's layers are not affected by density differences.

What is one characteristic of each mechanical layer? (hint: what would they 'shout' or 'sing'?)

• Each layer has a unique function and sound.

• All layers are silent and have no function.

• Mechanical layers are identical in function and sound.

• Mechanical layers do not exist.

Scientists study the Earth's deep interior that we can't reach or that's too hot or under too much pressure to reach by:

• using seismic waves to analyze the Earth's layers

• drilling deep into the Earth's crust

• using satellites to observe the Earth's surface

• conducting experiments in laboratories

A topographic map shows elevation by using:

• contour lines

• color gradients

• elevation markers

• 3D models

Pangaea is a supercontinent that existed during the late Paleozoic and early Mesozoic eras. Who proposed the idea of Pangaea?

• Alfred Wegener

• Charles Darwin

• Isaac Newton

• Galileo Galilei

Which of the following pieces of evidence supported the theory of Pangaea?

• Fossil distribution across continents

• The presence of similar climates in different continents

• The existence of a single ocean

• The discovery of ancient human artifacts

The name of the theory that the continents have moved slowly over time is:

• Plate Tectonics

• Continental Drift

• Seafloor Spreading

• Pangaea Theory

John Baumgardner’s theory of 'catastrophic plate tectonics' suggests that:

• the Earth's plates move slowly over millions of years

• the Earth's plates moved rapidly during a global flood

• the Earth's plates do not move at all

• the Earth's plates are controlled by extraterrestrial forces