Weathering
What is weathering?
The breaking down of rocks into smaller pieces.
What is erosion?
The movement of rock, soil, or sediment from one place to another.
What is depostion?
The dropping or settling of sediment in a new location.
Why do people try to prevent erosion?
To protect land, plants, animals, and buildings.
Is an earthquake a rapid change or a slow change?
Rapid change.
What type of weathering happens when tree roots grow into cracks in rocks?
Biological Weathering
Name one natural force that causes erosion.
Water, wind, waves, or ice.
When a river slows down and drops sand on a riverbank, what process is occurring?
Deposition
What tree can be used for erosion management?
Mangrove Tree
Is weathering usually a rapid change or a slow change?
Slow change.
Water freezes in a crack in a rock and makes the crack bigger. What process is this?
Mechanical Weathering
What can happen to a gully after heavy rain?
They can erode and and widen.
What materials are commonly deposited by rivers?
Sand, soil, rocks, and sediment.
How can planting trees help reduce erosion?
Tree roots hold the soil together.
Name one example of a rapid change to Earth's surface.
volcanic eruption, flood, landslide, tsunami, cyclone.
Name two things that can cause weathering.
water, wind, plant roots, temperature changes, chemicals.
Which causes erosion: tree roots growing in rocks or a river carrying soil downstream?
A river carrying soil downstream.
Why does deposition happen when water slows down?
The water loses energy and can no longer carry as much sediment.
What is one structure people build to manage coastal erosion?
Name one example of a slow change to Earth's surface.
Weathering, erosion, deposition, mountain formation.
How is weathering different from erosion?
Weathering breaks rocks down, while erosion moves the broken material.
Why might erosion be a problem for people?
It can damage land, homes, roads, and habitats.
Give one example of deposition in nature.
Sand dunes, riverbanks, beaches, deltas, or floodplains.
How did First Nations Australians care for Country to help protect the land?
Through sustainable land management practices known as soft-feet management.
Compare a flood and weathering. Which is rapid and which is slow?
A flood is a rapid change, while weathering is a slow change.