1.
The measure of the empty spaces in a material is called its

2.
The process of wearing down of Earth's surface and altering into landforms is called

3.
Sedimentary rocks includes

4.
The chemical or physical process by which rock exposed to the weather undergo changes in character and breakdown is called

5.
The hazard of mountain climbing is

6.
Different appearance of each layer is due to different type of

7.
Water expands on

8.
Weathering and erosion both alter its

9.
The top of mountains at night time are

10.
The carbon dioxide which is present in air produces weak acid in rain called

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