Rock Cycle

Which of these phrases defines subsidence?

• Earth's crust rising
• Earth's crust sinking
• Earth's crust shifting sideways
• Earth's crust moving in any direction

What must happen between tectonic plates to produce a rift zone?

• Two oceanic plates move toward each other
• Two continental plates move toward each other
• An oceanic plate collides with a continental plate
• An oceanic plate moves away from another oceanic plate

As a glacier moves along the ground, it transports rocks. These rocks pass over the ground and create scratches in the bedrock. Which statement correctly describes these processes?

• The transport of rocks and scratching of the bedrock are both examples of erosion
• The transport of rocks and scratching of the bedrock are both examples of weathering
• The transport of rocks is an example of erosion, and the scratching of the bedrock is an example of weathering
• The transport of rocks is an example of weathering, and the scratching of the bedrock is an example of erosion

Which statement about acid rain is true?

• Acid rain causes less erosion than normal rainwater does.
• Acid rain causes more erosion than normal rainwater does
• Acid rain causes less weathering than normal rainwater does
• Acid rain causes more weathering than normal rainwater does.

What must happen to igneous rock before it can change into sedimentary rock?

• It must be broken down into sediment
• It must melt and become magma
• Its minerals must be dissolved in water
• It must be exposed to high pressure and temperature