Features on the surface of the Earth such as mountains, hills, dunes, oceans, and rivers:

• delta
• erosion
• landform

The movement of weathered material on the Earth's surface by wind, water, and ice:

• erosion
• deposition
• landslides

A sudden release of energy under the Earth's surface that makes the ground shake or crack:

• weathering
• earthquake
• landform

The breakdown of rock into smaller particles from the effects of wind, water, and ice:

• deposition
• delta
• weathering

The buildup of land by depositing sediment and soil in a new location:

• earthquake
• weather
• deposition

A triangle-shaped (deposit) landform at the mouth of a river as it empties into a body of water:

• weather
• delta
• landform

When a river flows over the Earth and carves out a hole in the surface it makes a: 

• hill
• mountain
• canyon

A delta forms when the river meets the ocean because:

• the river is colder than the ocean.
• the river slows down and drops sediments.
• the Earth builds up pressure in the river.

What natural force formed the Grand Canyon millions of years ago?

• a landslide
• an earthquake
• a river

What is necessary for sand dunes to form?

• a loose sand and strong wind
• pressure in the Earth
• ice glaciers