Which of the following is not a characteristic of sedimentary rocks? They

• A. contain fossils
• B. are crystalline
• C. are usually laid down in layers
• D. are porous

Chemical weathering is both rapid and intense in the humid tropics because of?

• A. low annual range of temperature
• B. high rainfall and temperature
• C. the presence of easily weathered rocks
• D. a large volumes of run-off

Write explanatory notes on each of the following

(a) deforestation

(b) drought

The outer structure of the earth is made up of the following except?

• A. Mesosphere
• B. Atmosphere
• C. Biosphere
• D. Hydrosphere

Aluminum smelters are usually located close to sources of abundant?

• A. raw materials
• B. electricity
• C. coking coal
• D. cheap labour

Which of the following activities does not control soil erosion

• A. contour ploughing
• B. deforestation
• C. overcropping
• D. afforestation

A line graph is best for showing geographical phenomena that?

• A. vary continuously
• B. are linear in shape
• C. occupy areas
• D. have well-defined boundaries

The part of the earth's crust which is made up of silica and alumina is the_____?

• A. Sima
• B. Mantle
• C. Barosphere
• D. Sial

The rock type formed through the deposits compression of elastic particles is ?

• A. anthracite
• B. sandstone
• C. limestone
• D. mudstone

Some plant diseases are checked during the fallow periods in the bush fallowing system of agriculture because the

• A. humus accumulates over time
• B. fires used in clearing the bush destroy them
• C. plant species resist the diseases
• D. disease organisms lose their hosts and die