Environmental studies and Importance of Earths Components

Question 1

Surface of Earth

Answer 1

Average depth of oceans may be four kilometers.

Question 2

Earths environment segments

Answer 2

Lithosphere
Hydrosphere
Biosphere
Atmosphere

Question 3

Lithosphere

Answer 3

Mantle of rocks that constitutes the earth’s crust

Question 4

Soil

Answer 4

It is composed of inorganic minerals, organic matters, air and water.

Question 5

Hydrosphere

Answer 5

Composed of surface including oceans, seas, rivers, streams, lakes, glaciers, and ground water
Raw material for the manufacture of edible salts.

Question 6

Mass of water in hydrosphere

Answer 6

1400*10^18kg^1

Question 7

Characteristics of water

Answer 7

+ melting point
+ boiling point
Special behavior towards heat
Medium for all biological processes to take place

Question 8

States of water

Answer 8

Three states:
Steam
Liquid
Ice
Melts at 0
boils at100
Hydrogen bonding forms the basis of its highest density at 4

Question 9

Biosphere

Answer 9

Segment of environment where life exists

Question 10

Atmosphere

Answer 10

Umbrella of a mixture of gases that extends from the surface of the earth to an altitude of 500 km.
Atmospheric gases include nitrogen and oxygen as the major components in the ratio of 79:21.

Question 11

Clouds and rain

Answer 11

The atmosphere also provides a medium for the water vapors to rise from the seas and the ocean as a result of water evaporation to the higher atmospheric regions as they are lighter than the air near the surface of the earth.

Question 12

Atmosphere’s role

Answer 12

Balance between carbon dioxide and oxygen
Nitrogen balance