Question 1
- State three proofs that the earth is spherical
- Name three effects of the earth’s rotation.
Answer
- - 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.
- Arabica - 1. Causes day and night.
2. Causes hr. difference in time between meridian 150 apart.
3. Causes the rising and falling of ocean tides.
Question 2
- 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
- 1. It regulates temperature in both lower and upper atmosphere.
2. It is responsible for cloud formation/precipitation.
3. 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
- - 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
- Faulting happens when the Earth's crust completely breaks and slides past each other.
- - They are formed due to the collision of tectonic plates.
- They are formed due to the sinking of land between two river basins.
- They are formed due to the sinking of land between two normal faults or deep slopes.
Question 5
- State two reasons why a river may deposit its load
- Give three ways through which a river carries its load.
Answer
- - When its volume reduces.
- When the river meets another water body (like a sea or lake)
- When the river enters a shallow area and comes in contact with a flood plain.
- At the base of a waterfall. - - In solution
- Saltation
- Traction