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Define Craters and outline its mode of formation.

Define Craters and outline its mode of formation.

Answers

Martin
-A funnel shaped depression found on top of a volcano.

Modes of Formation

1.Cooling and Contraction of Magma

- Eruption occurs and a volcano is formed.
- Magma in the vent cools and contracts.
- It withdraws into the vent leaving a depression at the vents mouth e.g. Ngorongoro and Menengai craters.
- Rain water or water from melting snow may collect into craters to form crater lakes e.g. L. Paradise on Mt. Marsabit, L. Magadi on Ngorongoro Crater and L. Chala on Kenyan Tanzanian border.

2.Explosion

- Gases underground expand due to heat from magma.
- They force their way out through a weak line in the crustal rocks.
- An explosion occurs leaving a hole in the ground called a ring crater e.g. Ghama and Dobot craters in Tanzania and Hora craters in Ethiopia.
- Water from underground or rivers may accumulate into ring craters to form lakes called maars e.g. Lakes Katwe and Nyungu in Uganda.

3.Falling of a Meteorite

- A meteorite falls on the earth’s surface.
- It sinks into the rocks leaving a depression.
- Water may collect into the depression forming a lake e.g. L. Bosumtwi in Ghana
marto answered the question on March 25, 2019 at 06:56

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