Tscience w1

What are the two main types of evidence geologists use to study Earth's interior?

• Direct evidence from weather patterns and indirect evidence from satellite images

• Direct evidence from rock samples and indirect evidence from seismic waves

• Direct evidence from fossils and indirect evidence from animal behavior

• Direct evidence from surface rocks and indirect evidence from ocean currents

What are xenoliths?

• A type of ancient fossil found on the surface of the Earth

• Fragments of rock that come from deep within the Earth and are carried to the surface

• Rocks that are formed by the cooling of lava on the surface

• Large crystals found in volcanic rocks

At what depth do xenoliths, such as peridotite, typically form?

• 10 to 20 kilometers deep

• 25 to 30 kilometers deep

• 50 to 60 kilometers deep

• 70 to 80 kilometers deep

How deep have geologists drilled into Earth to gather rock samples?

• 5.0 kilometers

• 8.5 kilometers

• 10.0 kilometers

• 12.3 kilometers

What information do geologists learn from rock samples?

• The colors of the rocks

• The characteristics of the rocks, including minerals and formation conditions

• The age of the rocks

• The weight of the rocks

What do seismic waves produced by earthquakes help geologists study?

• The weather patterns on the Earth's surface

• The travel paths and changes in the makeup of rocks inside the Earth

• The growth of plants on the surface

• The types of animals living underground

Which type of seismic wave can travel through both solids and liquids?

• P-waves

• S-waves

• T-waves

• R-waves

Which type of seismic wave only travels through solids?

• P-waves

• S-waves

• T-waves

• R-waves

Why is it important for geologists to compare the paths of P-waves and S-waves?

• To understand how to predict earthquakes

• To learn how to create models of Earth's surface

• To gain insights into Earth's interior structure

• To find new types of rocks

What are the three main layers of Earth's interior?

• Crust, mantle, and atmosphere

• Crust, mantle, and core

• Crust, ocean, and core

• Crust, mantle, and surface