Deposition: Deltas and Dunes
Students will identify surface features of the Earth caused by constructive and destructive processes.
a. Identify surface features caused by constructive processes:
Deposition (deltas, sand dunes, etc.)
Weathering, Erosion and Deposition Cycle
Weathering is when rocks and soil are worn down.
Erosion is when the material that is worn down is carried away by wind, water, living beings or gravity.
Deposition is when those materials stop moving and build up somewhere else.
Erosion is when the material that is worn down is carried away by wind, water, living beings or gravity.
Deposition is when those materials stop moving and build up somewhere else.
What is a Delta and how is it formed?
When rain falls and snow melts the water flows downhill and forms a river. As the water is flowing it picks up small pieces of dirt and rock, which is known as sediment. This sediment is what makes rivers look brown. When a river gets close to the ocean the land flattens out and the river slows down. When the river slows down the sediment begins falling to the bottom of the river. Over time the sediment builds up and new land is formed, which forces the river to flow in a different direction. The river spreads out and begins flowing in many different directions forming a triangular type shape. Deltas are formed by erosion and deposition.
Sand Dunes
A dune is a mound of sand formed by erosion and deposition. Wind blows sand into a large mound. Once sand begins to build up, ripples and dunes are formed. Although usually found along the beach or in a desert, sand dunes can form in any landscape on Earth.
Study Guide Answers
(it doesn't do you any good to just copy the answers...
try to answer the study guide questions on your own first...
then use this link to check your answers)
Power Point Presentation
(this is where you will find all of the information you need for this unit...
of course you can use other resources...our textbook is a good one)
The Ring of Fire
(annoying, but informative)
(it doesn't do you any good to just copy the answers...
try to answer the study guide questions on your own first...
then use this link to check your answers)
Power Point Presentation
(this is where you will find all of the information you need for this unit...
of course you can use other resources...our textbook is a good one)
The Ring of Fire
(annoying, but informative)