Question 1
The diagram below shows the internal structure of the earth.
- Name the parts labelled P, Q and R.
- State the characteristics of the inner core
Answer
-
P- Atmosphere
Q- Core/Centrosphere and Barysphere
R- Mohorovicic discontinuity / Moho -
- Average density 16-17gm/cc/very high density
- It is solid in nature
Question 2
- Give two local winds that are found in Kenya.
- State three conditions that are necessary for formation of dew
Answer
-
- Anabatic winds
- Katabatic winds -
- Daytime should be warm.
- The air should be calm
- Low temperature below dew point
Question 3
Explain how the following factors influence climate.
i. Oceans currents
ii. Forests
Answer
i. Oceans currents
- Onshore winds blowing over a warm ocean current causing a warming effect raising the temperature of the adjacent coast.
- Onshore winds blowing over a warm ocean current picks up moisture causing rainfall on the adjacent coastal lands.
ii. Forests
- Temperature is lowered by the shade of the trees.
- Rainfall is higher duet to thigh rate of evapotranspiration.
- Onshore winds blowing over a warm ocean current causing a warming effect raising the temperature of the adjacent coast.
- Onshore winds blowing over a warm ocean current picks up moisture causing rainfall on the adjacent coastal lands.
ii. Forests
- Temperature is lowered by the shade of the trees.
- Rainfall is higher duet to thigh rate of evapotranspiration.
Question 4
- Define a lake
- State three reasons why some rift valley lakes are fresh water
Answer
- lLake - It is a body of water which occupies a basin, depression or hollow on the earth’s surface.
-
- It has surface and subterranean outlets through which excess salt deposits are carried away.
- It has regular inflow of fresh water from rivers, which dilutes the salts, keeping the water fresh.
- It is situated in an area of high rainfall, which keeps the water fresh.
Question 5
- Give two main components of soils
- List three factors that influence soil erosion
Answer
-
- Inorganic Matter
- Organic Matter -
- Nature of slope
- Nature of soil
- Prevailing climate conditions