Question 1
- What is an isobar
- (i) Name one method used for measuring cloud cover
(ii) State two characteristics of cumulonimbus clouds
Answer
- - This is a line drawn on a map showing areas that experience the same air/atmospheric pressure.
-
(i)
By remote sensing – using computerized cameras.
(ii) - They are dark at the base.
- They are sometimes white at the sides.
Question 2
-
State the period within which each of the following planets complete a revolution around the sun.
(i) Mercury
(ii) Earth.
- Give two reasons why the earth is flattened at the poles and bulged at the equator
Answer
-
(i) 88 days
(ii) 365/365 /366 days
-
- Earth rotates on its own axis to make a complete turn and the poles rotate on the axis and pulled towards each other by centripetal force causing flattening at the poles.
- During rotation of the earth, the equator covers a longer distance thus rotating faster with greater speed by centrifugal force leading to bulging.
Question 3
- State three causes of earthquakes
- Name two major earthquake zones of the world.
Answer
-
- Tectonic activities/movements/convergence & collision of plates/shifting of tectonic plates.
- Isostatic adjustments i.e. relative movements between the continental and oceanic crusts during isostatic recovery may trigger off earthquakes as a state of balance is restored.
- Vulcanicity/magma movement within the crust can cause tremors since the overlying crustal rocks are being displaced suddenly by the strong convectional currents/magma -
- Mid Atlantic Belt/Mid Indian Ocean Ridge.
- The Great Rift Valley Region.
Question 4
The tables below represent temperature and rainfall for two stations X and Y. Study them and answer the questions that follow
-
(i) Calculate the annual range of temperature for the stations X and Y.
(ii) Calculate the annual rainfall for station Y. - Describe the characteristics of rainfall for station X.
Answer
-
(i)
X : 270 – 250 = 20C
Y : 280C – 230C = 50C
(ii) 68 + 81 + 142 + 286 + 187 + 28 + 28 + 28 + 36 + 55 + 68 + 78 = 1085mm -
- The station experiences high rainfall/heavy.
- The rain falls throughout the year/it has no real dry season.
- The station experiences a double maxima rainfall regime/two peak rain seasons
Question 5
- Name two types of boundaries associated with plate tectonics theory
- State four evidences that support the continental drift theory.
Answer
-
- Transform faults/conservative boundaries.
- Extension boundaries/constructive margins/divergent. -
- Jig saw fit of continental margins e.g, eastern coastline of South America and western coastline of Africa.
- Similar geological structures between rocks in Brazil (South America) and Republic of South Africa (Africa).
- Distribution of ancient glacial deposits.
- Sea floor spreading i.e. younger rocks in the middle of oceans while older rocks found near the coasts