Question 1
- State two characteristics of equinoxes
- State three effects of the revolution of the earth
Answer
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- High temperatures
- High solar radiation
- Equal day and night. -
- Changes the position of the mid-day sun at different times of the year.
- Varying length s of days and nights.
- Causes the four seasons.
Question 2
- Give two examples of lava plateaus in Kenya
- Describe how a crater is formed.
Answer
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- Yatta plateau
- Uasin-Gishu plateau
- Laikipia -
-Eruption of lava through a central vent leads to the formation of a cone.
- Magma in the vent cools and contract.
- The magma withdraws into the vent leaving a shallow depression on top of the vent. This is a crater.
Question 3
Define epicenter.- State three human factors that influence earthquakes
Answer
- - The point on the surface directly above the seismic focus where earthquake waves are felt first
-
- Explosions from underground nuclear tests
- Train and explosive s used in quarries
-Construction of large dams.
Question 4
- State two ways in which springs are formed.
-
The diagram below represents an artesian basin. Name the parts marked K.L.M
Answer
-
- Latitudes of the oceans
- Ocean currents
- The depth of the ocean water.
- Openness of the ocean. -
- X- Low tide
- Y- High tide
Question 5
- State three factors that influence the temperature of ocean water
-
The diagram below shows the occurrence of tides. Name the parts marked X and Y.
Answer
- -Is a mass of ice of limited width which moves outwards from a central area of ice accumulation under the influence of gravity.
-
- Show fall occurs and show accumulates in pre –existing valleys and depressions on the earth surface.
- Continued snow fall increases the weight of the snow , compressing it resulting in thawing of some of the underlying ice.
- The melted water fills the existing air spaces before it re – freezes forming granular ice called the neve or firn..
- With time the ice becomes too thick , hard and has a glassy look because all air has been requested out of it. This ice is called a glacier and it moves because the lower layers are plastic due to its weight.