GEOGRAPHY TOPICAL QUESTIONS AND ANSWERS

ATIKA SCHOOL

Name two examples of plutonic rocks

5/7/2023

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Name two examples of plutonic rocks

Granite
Diorite
Peridotite
Gabbro
Syenite

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Give two ways through which rocks may be metamorphosed.

5/7/2023

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Give two ways through which rocks may be metamorphosed.

due to pressure changes/dynamic metamorphism
due to intense heat/thermal metamorphism
due to a combination of heat and pressure/thermal-dynamic metamorphism

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Explain two economic benefits of coral limestone rocks

4/7/2023

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Explain two economic benefits of coral limestone rocks. (4mks)

It is raw material for cement manufacturing which promote industrial development
Some coral rocks form attractive features which attract tourist who bring in foreign exchange.
Coral reefs are breeding ground for fish hence they help to promote the fishing industry.

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State three factors that influence rock metamorphism

4/7/2023

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State three factors that influence rock metamorphism. (3mks)

Rock resistance
Rocks texture and structure/grain size
Rock porosity
Solubility of rock minerals.

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What is rock metamorphism

4/7/2023

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What is rock metamorphism. (2mks)
A process where existing rocks undergo physical and chemical changes to form new rocks.

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State three characteristic of intrusive rocks

4/7/2023

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State three characteristic of intrusive rocks. (3mks)

Hard and highly resistance to erosion
Coarse texture
Formed deep into in the crust.

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Describe how intrusive Igneous rocks are formed

4/7/2023

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Describe how intrusive Igneous rocks are formed. (5mks)

Earth movement form cracks in the rock of the crust
Due to heat and pressure magma magma is forced through thecraks into the crust.
Magma cools and solidifies slowly forming rocks
Some are formed deep are called plutonic
Others are formed near the earths surface and are called hypabyssal rocks.

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Name three types of minerals

4/7/2023

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Name three types of minerals. (3mks)

Metallic minerals
Non metallic minerals
Energy minerals

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State three characteristics of minerals

4/7/2023

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State three characteristics of minerals. (3mks)

They have different degree of hardnesss
They have varying number of elements
They have specific colour
They have different texture.

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Distinguish between minerals and rocks

4/7/2023

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Distinguish between minerals and rocks. (2mks)
Minerals are inorganic homogeneous substances occurring naturally at or below the earths surface while rocks are naturally occurring substances that are aggregate of mineral particles.

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List THREE sources of sedimentary rocks

3/7/2023

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List THREE sources of sedimentary rocks. (3mks)

Pre-existing weathered rocks.
mineral compounds
Remains of organisms (dead plants and animals)

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Give TWO examples of mechanically formed sedimentary rocks

3/7/2023

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Give TWO examples of mechanically formed sedimentary rocks. (2mks)

conglomerates
Breccia
Boulder clay
Sandstone
Mudstone
Shale
Clay stone
Siltstone
loess

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Nature of the parent rock

3/7/2023

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Nature of the parent rock. (3mks)

Rocks minerals determine the fertility, colour and chemical characteristics of the soil.
Hard rocks weather slowly taking long time for formation of soil/soft rocks weather faster to form soil.
Determines soil texture, coarse grained rocks form coarse grained soils/fine grained rocks from fine soils.

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