Question 1
- Differentiate between rotation and revolution of the earth
- Study the diagram below and answer the questions that follow
Identify
(i) The season marked X
(ii) The date marked by A - State one characteristic of the summer solistice
Answer
- Rotation of the earth is the spinning of the earth on its axis in an anticlockwise direction from West to East while revolution is the movement of the earth along its orbit round the sun
-
i. The seasons market X –Autumn
ii. The date market A –Sept .23rd - Daytime is longer than night-time at latitudes beyond the equator
Question 2
The diagram below shows same types of folds. Use it to answer question (a)
- Name the type of folds marked E,F and G
- State two causes of folding
Answer
-
E – Asymmetrical
F – Over fold
G – Nappe /over thrust -
1. Tectonic forces which results in horizontal earth movement
2. Convectional currents within the mantle triggering off horizontal movement of the earth
Question 3
- State three ways in which wind transports its load
- Identify two features produced by water in arid areas
Answer
-
i. Suspension – Wind pica and curry house and dry unconsolidated materials like dust, the air current turbulence
ii. Surface area where wind push and roll heavy materials on the surface
iii. Siltation-Where by wind carries medium sized materials through services of hopes and jumps /looping or jumping. -
i. insulbergs
ii. Wadis
Question 4
- Describe how Lake Victoria was formed
- State the economic importance of lake Naivasha
Answer
-
- Earth movements caused crystals down warping
- Ahasin-Like depression was formed
- Uplifting of land masses around the depression deported the flow of rivers into the depression /caused reversed drainage
- Deposition into the depression resulted into ….. down warping –water from rivers accumulated in depression form a lake Victoria -
- It provides water for irrigation
- provides water for domestic /industrial use
Question 5
The diagram below represents underground features in a limestone area. Use it to answer question (a)
- Name the features marked X and Y
- Describe how the feature marked V is formed
Answer
-
X - stalactite
Y - Limestone pillar -
- Water on the surface percolates through the rocks of the roof of a limestone cave ‘
- This water ,which is a solution up calcium bicarbonate ,drips slowly from the roof of the cave to the floor
- Each drop which falls on the floor spreads out and evaporates
- Residue of caco3 which is in the form of tiny crystals ,is left on the floor
- More crystals form on top of the previous ones
- The accumulation of such crystals builds a structure upwards called a stalagmite