Destructive and Constructive Forces

What are constructive forces?

• Forces that destroy landforms

• Forces that move the Earth's plates

• Forces that build or create new formations

• Forces that cause earthquakes

What is an example of a slow constructive force?

• Tsunamis

• The formation of the Hawaiian Islands

• Earthquakes

• Landslides

What does erosion do?

• Builds mountains

• Breaks down land

• Creates new land

• Stops volcanic eruptions

Which of the following is a quick constructive force?

• Weathering

• Volcanic eruptions

• Formation of sand dunes

• Deposition of sediment

What is weathering?

• The breaking down of rocks

• The process of building mountains

• The creation of new islands

• The movement of tectonic plates

Which of the following is a quick destructive force?

• Formation of deltas

• Building of sand dunes

• Erosion by water

• Earthquakes

What can tsunamis do to the Earth's surface?

• Flatten land and erase hills

• Create new mountains

• Form new rivers

• Build sand dunes

How are mountains formed?

• By volcanic eruptions only

• Due to two tectonic plates being pushed into each other

• Through the deposition of sediment

• By quick destructive forces

What is deposition?

• The breaking down of rocks

• The movement of sediment by wind or water

• The cooling of lava to form new land

• The shaking of the Earth during an earthquake

What are examples of landforms created by constructive forces?

• Valleys and coastlines

• Deltas, sand dunes, and mountains

• Sinkholes

• Cracks in the Earth