Question 1
- Give two layers of the atmosphere.
- Give three proofs that the earth is geoid in shape
Answer
-
- Troposphere
- Stratosphere
- Mesophere -
- Photographs taken from the outer space show that the curvature of the earth is curved
- During eclipse of the moon, the earth casts a spherical – shaped shadow on the moon
- The earths horizon is curved as evidenced by approaching ships whose funnels and masks appear on the horizon before the rest of the ship is seen from the coast
- Circumnavigation of the earth along a straight path will bring one back to the same starting point from opposite direction.
Question 2
- Define the term faulting
- State three causes of faulting.
Answer
- - Faulting the cracking or fracturing of the rocks of the earths crust
-
- Tensional forces
- Compressional forces
- Tear/shear forces.
Question 3
Name any three relief features on the ocean floors.- State two causes of ocean currents
Answer
-
- Continental sheet/continental slope
- Ocean islands/coral Islands
- Deep sea trenches/Guyots/sea mount -
- Winds
- Earths rotation
- Shape of the landmasses
- Temperature and water density
Question 4
- State two ways through which vulcanicity leads to the formation of lakes
- Name two lakes found in Uganda formed by downwarping
Answer
-
- Lava daning rivers and water collects behind
- Blocking of craters & water collecting on it from rain water, melt water of from underground
- Lakes formed by down warping in Uganda -
- L. Kyoga
- L. Victoria
Question 5
- Give two ways in which springs form.
- Describe how a crag and tail form in a glaciated landscape.
Answer
-
- When a permeable rock lies on top of an impermeable rock on a hill, a spring
may develop at the function of the rock types
- Where the water table comes to the surface along the sides of a valley
- When there are faults and water percolates these faults and permeable rocks comes against the impermeable one -
- Formed when there’s a resistant rock on its cause. The side of the resistant rock where erosion takes place form a crag while the side where deposition takes place forms a tail
- The crag is steep while the tail is gentle