What are the two kinds of crust that the Earth has?

• Oceanic and Crustatious Crust
• Oceanic and Continental Crust
• Optic and Continental Crust

As scientists explore deeper and deeper into Earth's crust, what have they noticed about temperature and pressure?

• both temperature and pressure decrease
• both temperature and pressure increase
• pressure increases while temperature decreases
• temperature increases while pressure decreases

What causes the waves that scientists have used to gain most of their understanding of the composition of Earth's interior?

• earthquakes
• magnetic fields
• meteor strikes
• winds

Which layer of Earth would have the greatest density?

• upper mantle
• lower mantle
• inner core
• outer core

Which layer of Earth is characterized by rock that is plastic, or soft enough to flow?

• asthenosphere
• crust
• lithosphere
• inner core

True or False
The Earth's thin shell of hard rock is called the crust.

• True
• False

True or FalseHeat rising from deep inside earth can move the crust’s plates.

• True
• False

True or FalseThe most abundant elements in the Earth's crust are silicon and oxygen.

• True
• False

4. What layer is the hottest?

• Core
• Crust
• Mantle

5. Which layer is the thickest?

• Core
• Crust
• Mantle