Transcript How the Earth`s Surface Changes Over Time

How the
Earth’s
Surface
Changes
Earth’s Layers
How plates collide and pull apart.
Tectonic Plates
What do these plates look like?
How the plates broke and moved the continents over time
What the inside of the earth looks like when the plates move
http://www.ucmp.berkeley.edu/geology/tectonics.html
Tectonic Plates
•
•
•
•
14 major plates
Move about 5 cm. a year
Fit together like puzzle pieces
Build up pressure as they move
Tectonic plates continued
• When plates collide into each other it forms
mountains and volcanoes on the crust
• When plates pull apart from each other it forms
earthquakes and volcanoes on the crust
• When plates slide past each other it forms
earthquakes, mountains, and volcanoes on the
crust
Plates collide/crash/converge
together to form mountains and
volcanoes.
Plates pull apart/diverge/divide to
form earthquakes and volcanoes.
Plates slide past each other to form
earthquakes and volcanoes.
So now that the earth has
landforms, do those landforms ever
change? If so, HOW?
(How landforms change)
•
•
•
•
•
•
•
Water
Heat from the sun
Wind
Ice
Mass movement
Root pry
Gravity
Weathering
• Weathering is the process of breaking
down rock into soil, sand, and other tiny
particles called sediments.
Erosion
• Erosion is the process of moving sediment
from one location to another.
Erosion
Erosion
Deposition
• Deposition is the process of dropping off
or depositing sediment in a new location.
How wind can change the earth’s
surface:
• Winds pick up sediments and dust
particles and carry them long distances.
• Strong winds can blow hard against weak
rock and break it down.
How water changes the earth’s
surface:
• Rainfall
• Rivers
• Waterfalls
How ice can change the earth’s
surface:
• Glaciers grind the land as they move
slowly on the land.
• Glaciers pick up sediments as they move
and deposit in different locations.
How mass movements can change
the earth’s surface:
•
•
•
•
•
Mud slides
Avalanches
Rock slides
Sink holes
Creep (soil and grass on bridges)