Changing Earth Pre-Assessment

Which of the following changes to the Earth is caused by moving water?

• A new island forms in the middle of an ocean
• A plain becomes a deep canyon with steep walls
• A sand dune shifts from one location to another
• A mountain grows taller over a thousand years

How can a glacier change a mountain? A glacier can _

• generate a volcanic eruption
• cause a powerful earthquake
• make a mountain grow taller
• change the shape of a valley

A delta is a large collection of sediments at the mouth of a river. The river deposits its sediment when _

• the river slows down
• the water gets salty
• the sediment is small
• the temperature is cold

Over many years the bottom of a lake gets higher and higher. What could cause this slow change?

• The climate in the area gets warmer.
• Sediments are deposited in the lake.
• The Sun evaporates the water.
• A hurricane brings heavy rain.

Rocks that are carried in a quickly moving river for a long time are most likely to be _

• long and thin
• large and flat
• smooth and rounded
• black and shiny