Question

compare and contrast the constructive effect and destructive effect of an earthquake

Answer 1

CONSTRUCTIVE EFFECT-Constructive Earth processes are changes that add to the surface of the Earth, and some of them take millions of years to occur. The Hawaiian Islands are a great example of a slow constructive change. These islands have formed over millions of years due to a hot spot volcano. This type of volcano forms over an area in the Earth's crust where the crust is very thin and lava consistently makes its way to the surface. Each year the island that is currently over the hot spot (Hawaii) adds new land. There is even another island being formed that should reach above the surface of the ocean in 10,000 to 100,000 more years. Another example of a slow constructive force is the deposition of sediment at the mouth of a river. Water carries sediment down river and as the river becomes more shallow, the sediment is deposited, forming landforms such as deltas. Mountains are also an example of a slow constructive force due to two tectonic plates being pushed into each other.
DESTRUCTIVE EFFECT-destructive forces are forces such as earthquakes and tsunamis that can change the surface of our Earth in seconds. Tsunamis can flatten the Earth and erase hills. A tsunami will take thousands of feet of Earth and drag it back to the ocean floor. Earthquakes can cause the Earth to crack, causing sinkholes or other such phenomena. Quick destructive forces can also be things like landslides. Whole mountain sides can move to the base of a mountain in a matter of seconds.

Answer 2

Answer:

Constructive effects :

1. Earthquakes help the earth release its stored up energy. The majority of the earthquake occur around. The plate margins. This energy release helps to keep the earth in good shape

.2. On account of both vertical and lateral displacement of the earth’s crust earth-quakes may raise or lower parts of earth especially near the seashore. Sagami Bay of Japan was uplifted 200 m in 1923.

3. Landslides triggered by earthquakes cause formation of lakes as has happened at many places in the Himalayan region.

Destructive effects :

1. Human beings have settlements in active earthquake zones. Most often the houses and other structures collapse causing great loss of property

. 2. The forces of uplift and subsidence also cause submergence of coastal parts. For example: Dwarka in Gujarat which now lies submerged under the sea.

3. Earthquakes have changed the course of rivers in the past. They have thus rendered many areas unsuitable for irrigation and agriculture. They cause danger to human life.

Explanation: