Question 1
- Give three examples of mechanically formed sedimentary rocks
- State two changes that occur in sedimentary rocks when they are subjected to intense heat and pressure
Answer
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- Clay stone
- Siltstone – shale
- Mudstone -
- New minerals are formed
- Minerals recrystalize further
Question 2
The diagram below represents the earth on its axis. Use it to answer question (a)
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(i) Name the latitude marked G
(ii) What is the angle of inclination of the earth’s axis from it orbit? - State three ways that make the earth as a planet different from other planets
Answer
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(i) G - Tropic of cancer
(ii) 23.49 degrees -
- it has liquid water on it's surface
- maintains life
- has active plate movement
Question 3
- Name three external land forming processes that leads to the formation of lakes
- State three ways in which lakes influence the natural environment
Answer
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- Deposition /by water /ice
- Erosion/by wind /ice
- Human activities /damming /blowing up of land with explosives -
- Are reservoirs in the water cycle
- Support bio-diversity/support floras and fauna
- Enable self- purification of water and air
Question 4
The diagram below represents the flow of air current. Use them to answer question
- In your answer booklet, name the air current marked E and F
- Give the reason why air cools as it rises
Answer
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E – sea /lake breeze
F – land breeze - - As it rises it expands thus spreading over a wider area and hence becoming cooler
Question 5
The diagram below represents a coastal landform
- Name the features marked X and Y
- State three conditions necessary for the formation of a sand spit
Answer
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X – a cave
Y – a blowhole -
- A (weak) long current /drift
- An indented coastline /presence of a headland
- A shallow continental shelf