Deltas
What is a landform made of sediment at the mouth of a river?
Delta
What deep, narrow valley is carved by a river?
Canyon
What are hills of sand formed by the wind called?
Sand dunes
What is a large mass of ice that moves slowly over land?
Glacier
How does a delta form?
By deposition of sediment carried by a river as it slows at the sea
How are canyons like the Grand Canyon formed?
By erosion from river water cutting down through rock over millions of years.
What causes sand dunes to change shape over time?
Wind moving the sand around.
What is a hill or ridge made of sand deposited by the wind?
Dune
What fertile feature can form at river mouths and often supports diverse ecosystems?
Wetlands associated with deltas.
What is a famous canyon in the United States?
The Grand Canyon
What natural feature protects coastlines by trapping sand?
Coastal dunes
What flat plain is formed by rivers depositing sediment over wide areas?
Floodplain
What important role do deltas play in the environment?
They provide habitats for wildlife and act as buffers against floods.
What role does water play in the formation of canyons?
It acts as an agent of erosion.
How do sand dunes help the environment?
They provide habitats and protect land from erosion.
What steep landform is created by the action of rivers on mountains?
Gorge
Name a delta that is well-known around the world.
The Nile Delta
What effect does the width of a river have on canyon formation?
The wider the river, the wider the potential canyon.
Name a desert known for its extensive sand dunes.
The Sahara Desert
What large flat area of land is higher than the surrounding land?
Plateau