Question

Distinguish between
(a) Block Mountain and Fold Mountain
(b) Primary and Secondary Seismic
Waves

pls help me ​

Answer 1

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a) Block Mountain and Fold Mountain

Fold mountains are formed due to folding which occurs when the horizontal movements within the earth's crust move towards each other. Tension within the earth's crust causes block mountain formation. Block mountains are characterised by steep slopes and flat tops.

b) Primary and Secondary Seismic Waves

The waves that reach the earths surface first once energy is emitted from the earths surface are called primary seismic waves. The waves that reach the earths surface after the primary waves once energy is emitted from the earths surface are called secondary seismic waves

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Answer 2

Answer:

(a) Block Mountains and Fold mountains.

<> Block Mountains:

Block mountains are formed due to faulting.

Block Mountains are formed when the two tectonic plates move away from each other causing cracks on the surface of the Earth.

Block mountains are generally wider in length as compared to the fold mountains.

Example: Black Forest Mountains in Germany.

<>Fold Mountains:

Fold mountains are formed due to folding of the rocks.

Fold Mountains are formed when two tectonic plates move towards each other leading to the folding of the layers of the Earth.

Fold mountains are greater in length but comparatively smaller in width.

Example: The Himalayas.

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(b) Primary and Secondary Seismic Waves.

<> Primary Seismic Waves:

Primary Waves are also called P waves or Push waves, travel the fastest and thus are the first to arrive. Travelling at an average speed of 6 km per/s, these waves cause relatively smaller displacement (low tremors).

<> Secondary Seismic Waves:

Secondary waves or S waves or Shake waves, arrive the next, moving at lesser speeds than the P waves. These waves produce a strong shaking effect. These do not pass through liquids.

Explanation:

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