1. How and why does earth’s lands change?
Physical Processes
How and why does earth’s lands change?

2. 3 Ways lands change:
Erosion
Ocean Currents
Earthquakes
Volcanoes

3. Erosion (Weathering)
With time, rocks and soil break down due to heat, water, ice and pressure, a process known as weathering. Erosion occurs when all the weathered particles fly away or are carried into waterways. Erosion causes rivers and deltas and shapes shorelines around the world.
erosion- forces that shape
the earth’s surface
such as wind, water and ice.

4. erosion

5. Ocean currents
Ocean currents occur when ocean waters continuously move. They may occur on the surface or in deep water.
These currents affects the climate in a region.
It can change the temperature and precipitation.
ocean currents- The steady flow of ocean water due to
wind and gravity.

6. Ocean currents around the world

7. Earthquakes
The Earth has 7 major plates that affect the physical environmental processes of earth.
African Plate
Antarctic Plate
Eurasian Plate
Indo-Australian Plate
North American Plate
Pacific Plate
South American Plate .
earthquakes- movement of the earths surface which may form mountains, valleys and folds.

8. Volcanoes Volcanoes are most common in the Ring of Fire.
Volcanoes- Opening in the earth’s crust that allows magma,
ash and gases to escape.

9. Mount Pinatubo, The phillpines 1991
This volcano killed 800 people, left 100,000 homeless and caused half a billion dollars in damage.

10. These plates are located on the Earth’s mantle and tend to shift in 3 ways causing earthquakes.
---They pull apart
---They slide against each other
---They collide (process which create mountains)
Earthquakes cause the Earth to shake so intensely that buildings and bridges fall down and streets and highway may crack causing deaths by the thousands.
There are about 8,000 earthquakes a year.
These quakes may cause Tsunamis, which are huge
waves than rush into the shoreline with great force and may cause deaths too.

11. Movie Time
Click on the hyperlink to watch a two minute video called “How earthquakes work”.
Click below in slide show mode and the page opens scroll down and click on play movie

12. Do physical processes affect me?
YES!!!!
Physical processes have a great impact on why people live where they do. People
that face big changes in their environment are affected greatly. The weather might
change dramatically, or recurrent Earth crust movements might force them to move to another location.