Question 1
- Give two kinds of rock metamorphism
- State three characteristics of metamorphic rocks
Answer
-
- Thermal/contact
- Dynamic/kinetic -
- Rocks are harder than the original rocks
- Minerals in the rock re-crystallise
- Formed from pre-existing rocks
Question 2
- Define the term precipitation
- State three conditions that are necessary for the formation of fog
Answer
- - This is any product of the condensation of atmospheric water vapour that falls on the earth’s surface under gravity
-
- Cold nights during colder months in areas experiencing winter
- The winds must be light/calm to hold water droplets in suspension
- Clear sky/absence of clouds to permit free terrestrial radiation
Question 3
The diagram below shows some features of vulcanicity. Use it to answer the questions that follow
- Identify the features marked A and B.
- Name three examples of the feature marked C found in the Kenyan rift valley
Answer
-
A – lopolith
B – sill -
- Suswa
- Longonot
- Menengai
Question 4
- Give two processes of wind erosion in deserts
- State three physical factors which contribute to the development of deserts
Answer
-
- Abrasion
- Deflation -
- High temperatures causing excessive evaporation
- Occurrence of rain shadow effect
- Prolonged period of drought/very low rain
Question 5
- Name two types of soil according to texture
- State three ways in which soil erosion can be controlled.
Answer
-
- Loamy
- Clay -
- Afforestation and reafforestation programs
- Proper ploughing techniques
- Mulching