Science~Chapter 2

The crust and upper mantle make up Earth's_________.

• lithosphere
• asthenosphere
• core
• continents

Which helped the newly formed Earth become a sphere in shape?

• the magnetic field
• gravity
• density
• heat

Which best describes why landforms are not permanent?

• Gravity pulls on landforms molding them to be spherical in shape.
• Once created landforms do not change.
• Earth's magnetic field compresses the surface. 
• Landforms are shaped by erosion and uplift. 

How long ago do scientists believe our solar system formed?

• 3.4 billion years ago
• 4.6 billion years ago
• 5.3 billion years ago
• 6.4 billion years ago

Scientists believe that differences in _________ cause hot, plasticlike rocks in the asthenosphere to rise toward Earth's surface. 

• density
• magnetism
• weight
• composition

Glaciers are part of Earth's ______.

• atmosphere
• hydrosphere
• mantle
• outer core

Why are plains the best landforms for growing crops or grazing animals?

• Growing crops or grazing animals has to be done on plains because they cover most of Earth. 
• Plains have high relief which allows for more precipitation to get to them.
• The soil found in plains is often rich in deposits, which allow for plants to grow.
• Plains have a low elevation, making it easier to lead animals to them.

Which layer of Earth is the densest?

• crust
• mantle
• outer core
• inner core

The alignment of iron minerals in rocks when they formed reflects the fact that Earth's ____ has reversed itself several times in the past. 

• magnetic field
• core
• asthenosphere
• gravity

_________ is a major characteristic used to differentiate between a plain and a plateau. 

• core
• landform
• elevation
• mantle