Lesson 2 4.2 grade 4

The sides of a mountain could be broken down by the effect of …………and weather erosion.

• Speed

• Gravity

• Wind

• Sediments

• Valleys

Canyon is a special type of.................. that has steep sides.

When the water of a river travels down a steep slope, its..............increases.

The force of water stream can erode a lot of.................of a mountain and carry them away.

Rainwater is pulled downhill forming small streams due to the effect of

• speed

• wind

• sediments

• valleys

• gravity

The Grand Canyon in USA is very large and steep.

• ✓

• X

The formation of a patch of sand in a certain place after a heavy rain is an example of the deposition process.

• ✓

• X

The shape of a rock will be rounded and worn due to the effect of deposition process.

• ✓

• X

The river movement can take the rocks away around mountains.

• ✓

• X

The Grand Canyon took short period of time to be formed.

• ✓

• X