Earth Lesson 8

Front

What is an esker?

Back

A long ridge of gravel and other sediment, typically having a winding course, deposited by meltwater from a retreating glacier.

Front

What are sand dunes?

Back

Mounds of sand formed from wind, usually near beaches.

Front

What is a lahar?

Back

A mudflow made of ash and debris from a volcano.

Front

How does heavy rain affect a lahar?

Back

Heavy rain over a short period of time will cause a severe lahar because it will saturate loose soil.

Front

What is loess?

Back

Silt deposited from wind-blown dust.

Front

What is glacial erosion?

Back

The process by which glaciers remove rock and soil as they move.

Front

What is glacial abrasion?

Back

The grinding away of rock by the friction and impact of glacier movement.

Front

What is a moraine?

Back

A mass of dirt and rocks that has been pushed along by a glacier.

Front

What is the difference between a lahar and a mudslide?

Back

A lahar is specifically a mudflow made of volcanic ash and debris, while a mudslide can consist of any loose soil and debris.

Front

What causes sand dunes to form?

Back

Sand dunes form due to the wind blowing sand particles and depositing them in mounds.