Floods, Erosion, Deforestation, and Desertification

What is a flood?

• A strong wind

• Overflow of water onto land

• Earthquake on land

• Heavy snowfall

Which of the following can cause a flood?

• Planting more trees

• Proper drainage system

• Heavy rainfall

• Recycling

One of the effects of flooding is:

• Increase in rainfall

• Destruction of houses

• Fertile soil

• Building of roads

Which human activity increases the risk of flooding?

• Road construction

• Tree planting

• Deforestation

• Fishing

Which of these helps prevent flooding?

• Building houses on water paths

• Cutting down trees

• Planting vegetation

• Dumping refuse in gutters

What is soil erosion?

• Movement of air

• Washing away of topsoil

• Growing of crops

• Freezing of land

The top layer of soil that is washed away during erosion is called:

• Bedrock

• Gravel

• Topsoil

• Sand

Which of these helps reduce soil erosion?

• Deforestation

• Overgrazing

• Planting cover crops

• Bush burning

What natural force causes erosion?

• Earthquake

• Lightning

• Wind and water

• Sunshine

A major effect of soil erosion is:

• Increase in soil fertility

• Formation of new land

• Loss of fertile land

• Earthquakes