Weathering

Question 0

Name two ways how the earths crust naturally change

Answer 0

Weathering and erosion

Question 1

Define the word denudation

Answer 1

The processes of weathering and erosion

Question 2

Name two types of weathering

Answer 2

Mechanical

Chemical

Question 3

Define the word weathering and erosion

Answer 3

Weathering
-The breakdown and decay of rocks

Erosion
-The breakdown of rocks and the removal of the particles that result

Question 4

Name three causes of Erosion

Answer 4

Moving water (rivers,sea,)
Moving ice (glacier)
Moving air (wind)

Question 5

What effect does Mechanical Weathering do to rocks?

And name one type of Mechanical weathering

Answer 5

Freeze thaw

It causes rock to be broken up into smaller pieces

Question 6

Define the word freeze thaw

Answer 6

It is the break-up of rock by frost action

Question 7

Where does freeze thaw occur?

Answer 7

It occurs where there is precipitation and the temperature rises above and falls below freezing point.It occurs mainly in upland areas

Question 8

Describe the process of freeze thaw

Answer 8

By day
-water seeps into joints in the rock

By night
-The temperature drops below freezing point.The water freezes and expands.This makes the cracks bigger and put strain on the rock

Over time
-After repeated freezing and thawing,The rock splits.These pieces of rock are called scree.They roll down the mountainside and collect in piles at the bottom of the the slope

Question 9

What are scree?

Answer 9

Loose pieces of rock with sharp edges and are broken off by freeze thaw

Question 10

Name one type of chemical weathering

Answer 10

Carbonation

Question 11

Describe how stalactites are formed

Answer 11

When water flows down through the ground and into a cave, it dissolves a mineral called calcite (a major building block of limestone) and carries it through cracks in the ceiling. The dripping water leaves behind traces of calcite, which slowly builds up on the ceiling until a stalactite takes shape, hanging down like an icicle.

Water from the end of the stalactite leaves more calcite in a pile on the cave floor, and pretty soon a cone-like stalagmite forms.