The correct answer is A. landslide.
A landslide is a large mass of rock, earth, or debris that moves down a slope. Landslides can be caused by a number of factors, including heavy rainfall, earthquakes, and volcanic eruptions. They can also be caused by human activities, such as deforestation and construction.
Landslides can cause significant damage to property and infrastructure. They can also be deadly, as they can bury people and vehicles.
There are a number of things that can be done to prevent landslides, including:
- Reducing the amount of water on slopes. This can be done by planting trees and other vegetation, which will help to absorb water.
- Stabilizing slopes. This can be done by installing retaining walls or other structures.
- Avoiding construction on unstable slopes.
If you live in an area that is prone to landslides, it is important to be aware of the risks and to take steps to protect yourself and your property.
The other options are incorrect because:
- Earthquakes are caused by the sudden release of energy in the Earth’s crust.
- Volcanoes are formed when magma, or molten rock, rises to the surface of the Earth.
- Floods are caused by an excessive amount of water in an area.