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Changes on Earth
Transcript of Changes on Earth
Changes that happen over
many, many years.
Changes that happen in
seconds, minutes, or days.
Weathering: The breakdown of
Earth's crust into sediment.
Weathering & Erosion
Plate tectonics- explains the formation and movement of Earth's plates.
Continental drift- a theory that the continents move slowly across Earth's surface. It explains why the continents seem to fit together like puzzle pieces.
Glaciers form in places where
more snow falls than melts or sublimates.
Layers pile up and the weight packs the
snow into glacial ice.
Erosion: Weathered rock is carried away by gravity, wind, water and ice.
Flow of water moves rocks and sand
Push of the wind
Movement of glaciers dropping
rocks at bottom of oceans and lakes.
ABC News (First 2:50 min)
A place where lava reaches the surface.
Used to describe a sudden slip on a fault, and the resulting ground shaking caused by the slip
Caused by volcanic or magmatic activity
Caused by other sudden stress changes in the Earth
Scientists who study earthquakes = seismologists
Machine that measures earthquakes = seismograph
Wave energy that comes from an earthquake = seismic waves
The surface of the Earth is continually changing and will continue to change, both quickly and slowly, forever.
Today’s planet is very different than early Earth.
How Erosion works:
A rapid (quicker than erosion) movement of rocks and soil, caused by gravity and/or extreme weather events.
Mid-ocean ridge : a chain of underwater mountains
Seafloor spreading: where new crust is created at mid-ocean ridges
Ocean trenches : crack in ocean floor where plate sinks into Earth's crust
"Puzzle Piece" Continents
EVIDENCE OF CONTINENTAL DRIFT:
Divergent : spreading apart
Convergent : squishing together
Transform: sliding against each other in opposite directions
TYPES OF PLATE BOUNDARIES:
: rapid movement of large amounts of rock and soil.
: rapid movement of soil and other sediment mixed with water.
: soil gradually moves down a slope.
: weakened layers of soil and rock move downslope as a single unit.
Earth Science Slides Presentation - An Introduction to Earth Science