Lesson 2 Concept 4.2 G4

Among the evidence for the beginning of formation of small canyon by the effect of running water is___________

• the deep slopes of its sides.

• trees and plants that are growing on its sides.

• the little amount of rains that flow over it.

• the rocks and sediments that are found on its sides.

If the big rocks of a mountain were broken off, this is an evidence of________

• weathering process only.

• erosion process only.

• weathering and erosion processes.

• weathering and deposition processes.

Recognize the signs of weathering, erosion and deposition may help in all the following, except.._______

• building houses in safe places.

• not building houses on hills that are eroding.

• not building houses very close to a river.

• building houses on a hill affected by erosion.

The rainwater gather in small streams due to the_________downhill

• pushing force of gravity

• pulling force of gravity

• pushing force of friction

• pulling force of friction

_______can erode valleys and form canyons across them.

• Rivers

• Mountains

• Dunes

• rocks

The shape of the valley depends on all of the following factors, except._________

• type of rocks.

• speed of the river.

• size of rocks.

• size of the river.

Rivers that flow fast can cause more________than rivers with slow slope

• chemical weathering

• erosion

• deposition

• Rocks

When the water of a river travels downhill on a steep slope, its speed_________

• stays constant.

• decreases to half.

• decreases to quarter.

• increases.

Canyon is a special type of ________that has steep sides

Rivers cause less erosion of rocks than small streams

• True

• False