Our Changing Earth

A glacier is a slowly moving mass of __________.

• rock
• wind
• ice 
• sediment

Tiny pieces of rock wear down bigger rocks through ____________

• ice wedging
• chemical weathering
• abrasion
• deposition

As a glacier moves, __________ inside it can wear down a mountain.

• chemicals
• sand and rocks
• plants
• cracks

Oxygen and carbon dioxide can cause ______________.

• deposition
• mechanical weathering
• glaciers
• chemical weathering

In deposition, __________ builds up in a place.

• water
• ice
• sediment
• carbon dioxide

Ocean __________ erode sand from beaches

• glaciers
• waves
• rocks

A mountain's shape can tell us where a _________________ formed in the past.

• glacier
• deposition
• plant

Ice wedging happens when water freezes in a _________________ in a rock.

• plant
• hole
• crack

Earthquakes and ____________ can change Earth's surface quickly.

• wind
• volcanoes
• water

__________ carries dust and soil through the air.

• water 
• wind
• glaciers