CLASS-7 CHAPTER-WATER
Q(i).What is precipitation?
Answer. Precipitation in the deposition of moisture from the atmosphere onto the earth's surface.This may be in form of rain,hail,frost,fog,sleet or snow.
Q(ii).What is water cycle?
Answer..The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.
Q(iii).What are the factors affecting the height of the weaves?
Answer.
(a) High speed of wind
(b)Earthquake
(c) Volcanic Eruption
(d) Underwater Landslides.
Q(iv).Which factors affect the movement of ocean water?
Answer. (a) Temperature
Q(i).What is precipitation?
Answer. Precipitation in the deposition of moisture from the atmosphere onto the earth's surface.This may be in form of rain,hail,frost,fog,sleet or snow.
Q(ii).What is water cycle?
Answer..The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.
Q(iii).What are the factors affecting the height of the weaves?
Answer.
(a) High speed of wind
(b)Earthquake
(c) Volcanic Eruption
(d) Underwater Landslides.
Q(iv).Which factors affect the movement of ocean water?
Answer. (a) Temperature
(b) Rotation of the earth.
(c)Warm and cold currents.
(d)Gravitational pull of the sun,the earth and the moon.
Q(v) What art tides and how are they caused?
Answer. The rhythmic rise and fall of ocean water twice a day is called a tide. Tides are caused due to the gravitational pull exerted by the sun and the moon on the earth's surface.
Q(v-2)Name three types of rainfall?
Ans There are three types of rainfall:
Q(v) What art tides and how are they caused?
Answer. The rhythmic rise and fall of ocean water twice a day is called a tide. Tides are caused due to the gravitational pull exerted by the sun and the moon on the earth's surface.
Q(v-2)Name three types of rainfall?
Ans There are three types of rainfall:
(1)The conventional rainfall
(2) The orographic rainfall
(3) The cyclonic rainfall.
Q(vi). What are ocean currents?
Answer. Ocean currents are streams of water flowing constantly on the ocean surface in definite directions.
Question 2.Give resons.
Q(i) Ocean water is salty?
Answer 1. Because it contains large amounts of dissolved salts.
2 The concentration of salt in seawater (salinity) is about 35 parts per thousand.
Q2. The quality of water is deteriorating.
Ans the quality of water is deteriorating due to the following reasons;
Answer. Ocean currents are streams of water flowing constantly on the ocean surface in definite directions.
Question 2.Give resons.
Q(i) Ocean water is salty?
Answer 1. Because it contains large amounts of dissolved salts.
2 The concentration of salt in seawater (salinity) is about 35 parts per thousand.
Q2. The quality of water is deteriorating.
Ans the quality of water is deteriorating due to the following reasons;
- industrial wastes are mixing with water,
- dumping of solid waste into water,
- over using of chemicals and pesticides in agriculture.
