Y5 our changing world

What causes Physical weathering?

• A substance reacting to the minerals in rocks.

• Changes in temperature, freezing and thawing, and the effects of wind, rain and waves.

• Roots from trees and other plants may grow into or under rocks with such force that they can cause damage or even split the rock in two!

Answer explanation

What causes chemical weathering?

• processes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves.

• a substance reacting to the minerals in rocks.

• plants break up rocks with roots or root exudates

_____________________ is the movement of soil and rock by wind, water, ice, and gravity.

• Erosion

• Deposition

• weathering

This is an example of __________________________.

• Physical weathering

• Chemical weathering

Why might a bay form?

• 
  On a discordant coastline the softer rock will be rapidly eroded away, leaving the harder rock to form headlands

• On a concordant coastline weaknesses allow the water to work its way in and eventually erode a large area

• A collapsed volcanic crater is flooded leaving a sheltered area

• 
  Former river valleys are flooded and form ports that gradually turn into bays

How are sand dunes formed?

• 
  The sea pushes the sand into hills

• 
  The wind blows the sand into hills

• 
  They are man made

• 
  Rivers push the sand into hills

On some coasts the cliffs are worn away by erosion. What acts on the cliffs to cause them to erode?

• Pebbles

• Sand

• Waves

• Rocks

Identify this coastal landform.

• Arch

• Stump

• Stack

• Cave

Identify this coastal landform.

• Stack

• Arch

• Cliff

• Spit

Erosion has created the following land form

• Headland

• Arch

• Stack

• Cave