P1: The physical environment

Question 1

The environment is said to constitute as __

Answer 1

“Life support system”

Question 2

The basic components of the natural environment

Answer 2

1. Atmosphere (air)
2. Hydrosphere (water
3. Lithosphere (soil)
4. Biosphere (living components)

Question 3

above the earth’s surface, extends up to a height of 20 kms above the equator. 8 kms over the pole. Upper extreme tempt may drop to 60 celsius.

Answer 3

The troposphere

Question 4

Contains the ozone layer, 30 kms thick. The temperature may rise from -60 celsius to 0.

Answer 4

The Statosphere

Question 5

Zone is characterized by gradual decline in temperature to about 90-degree celsius. 40 km thickness

Answer 5

The mesosphere

Question 6

The constituents of this zone are in an ionized state

Answer 6

The thermosphere

Question 7

Three types of rocks are found in the earth’s crust

Answer 7

1. Igneius rocks
2. Sedimentary rocks
3. Metamorphic rocks

Question 8

Formed by cooling and solidification of molten rock material called magma e.g. basalt

Answer 8

Igneous Rocks

Question 9

Develop by gradual accumulation consolidation and hardening brought about by wind and water. Characterized by distinct sedimentary layers.

Answer 9

Sedimentary rocks

Question 10

Results of a metamorphosis of igneous and sedimentary rocks due to intense heat and high pressure

Answer 10

Metamorphic rocks

Question 11

Changes in the earth’s crust as a result of atmosphere and hydrosphere

Answer 11

weathering

Question 12

Major agents responsible for this are water, air, oxygen-carbon dioxide. Slow and simple process

Answer 12

Chemical weathering

Question 13

Brought by a mechanical process due to changes in temperature water and wind

Answer 13

Physical weathering

Question 14

Caused by a number of organisms that aid in the disintegration of rocks.

Answer 14

Biological weathering