Question 1
- State three proofs that the earth is spherical.
- Name three effects of the earth’s rotation
Answer
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- Satellite photographs of the earth taken from space show it to be spherical.
- During Lunar eclipse the shadow of the earth which is cast on the moon appears spherical.
- Other planets are spherical, so it should also be.
- When a person circum-navigates the earth in a straight line, he/she will come back to the same position. -
- Deflection of water currents and winds.
- Causes day and night.
- Causes 1hr difference in time between meridian 15° apart.
- Causes the rising and falling of ocean tides.
Question 2
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What is an air mass.
- Give three benefits of humidity in the atmosphere
Answer
- - Massive air moving in a certain direction covering a massive area has same characteristics of both pressure and temperature
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- It regulates temperature in both lower and upper atmosphere.
- It is responsible for cloud formation/precipitation.
- It helps in development of storms/energy in the atmosphere.
Question 3
Use the diagram below to answer the questions that follow:-
- What causes sea breeze
- State two effects of sea breeze
Answer
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- Differences in atmospheric pressure between the land and the sea, the land has a lower pressure.
- Differences in temperature between the land and the sea, land is warmer -
- It lowers the high temperature on land (cooling effect).
- It might lead to convectional rainfall.
Question 4
- What is faulting
- Give three ways through which a rift valley may be formed
Answer
- This is the fracturing and cracking of the earth’s crust along lines weaknesses on the crust.
-
- Through tensional movement.
- Through compressional movement.
- Through crustal arching.
Question 5
- State two reasons why a river may deposit its load.
- Give three ways through which a river carries its load.
Answer
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- When its velocity drops.
- When the load is in excess.
- When its volume reduces. -
- In solution
- Saltation
- Traction
- Suspension