1. Earth’s Landforms
Chapter 1
Lesson 1

2. Where do Landforms come from?
Plate tectonics
Large, slow moving plates that make up Earth’s surface. When moved, they carry continents and the ocean floors!

3. Where do Landforms come from?
PANGAEA & Continental Drift
SUPERCONTINENT! Continental drift theory is the belief about what broke Pangaea up into the seven continents.

4. Where do Landforms come from?
Mountains:
Formed when plates push together, crumble and fold. Also when plates push together and one moves over the other.
Ex. Himalayas, Cascade Mts.

5. Where do Landforms come from?
Earthquakes…..
Caused by the movement of tectonic plates. Most common around fault (break in Earth’s surface where movement can occur).
Ex. San Andreas Fault

6. THINK ABOUT THIS……
Two cars driving VEEERRRRYYYYY SLLLOOOWWW bump into one another. Do the passengers in the car feel the bump?
DUHHHH. Now multiply the size of those cars by 100,000 (tectonic plates). Will the bump feel larger or smaller?????

8. Volcanoes FORM: KINDS OF VOLCANOES SHAPED EARTH
When two plates push together and one goes up and the other goes down. Lower plate melts into magma.
KINDS OF VOLCANOES
Shield volcano, cinder-cone mountain
SHAPED EARTH
Add land when the lava cools and hardens

9. THINK ABOUT THIS…… Water on the stove… Water gets hotter and
hotter (tectonic plate)
until it…….
BOILS!! (volcanic eruption)

10. EARTH’S SURFACE Weathering Wind and Water
Process of breaking up rocks into smaller pieces called sediment.
Wind and Water
Two major forms of weathering

12. Erosion:
Process of moving sediment from one place to another
Deposition
Process of dropping sediment into a new location
Deposits add to the floodplain (the land next to a river)

14. People Shape the Land People use floodplains for farming
Settle near water…..why?
Reshape waterways
Ex. Building dams, creating lakes
Direct water into dry places
Irrigation
How else do people affect the shape of the land???

15. GROUP QUESTIONS
HOW DO PLATE TECTONICS CHANGE THE SHAPE OF THE LAND? (3 WAYS)
HOW DOES WEATHERING AFFECT THE LAND?
WHATS THE DIFFERENCE BETWEEN EROSION AND DEPOSITION?
HOW DO VOLCANOS CHANGE THE LAND AROUND THEM?