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Earth Science Review
What are physical features on the earth’s surface?
What are the four agents that constantly change the earth’s landforms?
Water Wind Ice Mass movement
What is weathering?
The process of breaking rock into silt, sand, clay, and other tiny pieces
What are these tiny pieces called?
How does water weather rocks?
Rivers can carve deep canyonsOcean waves can weather cliffs Freezes in cracks and expands breaking the rock apart Acid rain dissolves rock Tumbles rocks into each other
What is erosion?
The process of moving sediment from one place to another
What is the process called of dropping it into a new location?
How does water erode sediment?
Waves take the sediment from the cliffs to the beachRainfall carries it to rivers and streams Rivers carry it to their banks Some rivers carry it to their mouths
What is a delta?
The new land that has been deposited in a triangle shape near the mouth of a river
What does wind erode more quickly?
Dry soil instead of wet soil
Where is this greatest?
Where there is little plant life to hold sediment in place
What unusual landforms can wind erosion create?
Tables Arches Columns
What are dunes?
Large mounds of sand
What are beach dunes caused by?
The constant blowing of the sea breeze
What are glaciers?
Large thick sheets of ice formed when more snow falls during the winter than melts in the summer
Why does a glacier erode everything under it?
It’s great size and weight
What are the two kinds of glaciers?
Valley and Continental
Where are valley glaciers found?
High in mountain valleys
How do they erode?
They flow slowly down the mountainsides
What do they form?
A U-shaped valley
How many are left?
Very few and these are melting quickly
What are continental glaciers?
Thick sheets of ice that cover large areas of the Earth
What is mass movement?
The downhill movement of rock and soil because of gravity.
Give some examples of mass movement
Mudslides Landslides Avalanches Sinkholes
How does a landslide or mudslide occur?
The force of gravity is greater than the force of friction holding the soil
What is creep?
The slow movement of soil downhill
How fast does it move?
Only a few centimeters each year
What is a sinkhole?
A large hole in the ground that opens suddenly
How does a sinkhole occur?
The limestone beneath the surface erodes and the land over the weakened area collapses?
How does erosion and deposition effect the landforms?
It can change them or produce new ones.
What are terminal moraines?
The long ridges of soil and rock left behind by glaciers.
Give an example of it.
Long Island or Cape Cod
How are new islands formed?
How does this happen?
Slowly over time the melted rock and ash continue to be deposited on top until the it appears over the surface of the water
Changes to the Earth’s Surface
Our Changing Earth.
Constructive and Destructive Forces that effect Earth’s Landforms
Changes to Earth’s Surface.
Weathering and Erosion Video Questions &Answers
The Grand Canyon. The Grand Canyon in Arizona was carved out of the Earth by erosion. Erosion is the process by which weathered rock and soil are moved.
Changes to Earth’s Surface Chapter 9
The movement of sediments by wind, water, ice, or gravity.
Wearing Down Earth’s Surface
Erosion and Soil Depostion
Changes to the surface of the Earth….
What causes changes to Landforms?
Types of Landforms Caused by Erosion & Deposition
Weathering, Erosion, and Landforms
Weathering and Erosion
Erosion and Deposition 6 th Grade Earth Science October 2012.
Erosion and Deposition
Constructive & Destructive Forces on Landforms
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