Earth’s LandformsEarth’s Landforms

Chapter 1Chapter 1

Lesson 1Lesson 1

Where do Landforms come Where do Landforms come from?from?

• Plate tectonicsPlate tectonics– Large, slow moving Large, slow moving

plates that make up plates that make up Earth’s surface. Earth’s surface. When When moved, they carry moved, they carry continents and the continents and the ocean floors!ocean floors!

Where do Landforms come Where do Landforms come from?from?

•PANGEA!!!PANGEA!!!– SUPERCONTINENT! Continental SUPERCONTINENT! Continental

drift is what broke Pangea up into drift is what broke Pangea up into the seven continents. the seven continents.

Where do Landforms come Where do Landforms come from?from?

• Mountains:Mountains:– Formed when Formed when

plates push plates push together, together, crumble and crumble and fold. Also when fold. Also when plates push plates push together and one together and one moves over the moves over the other.other.•Ex. Himalayas, Ex. Himalayas,

Cascade Mts. Cascade Mts.

Where do Landforms come Where do Landforms come from?from?

• Earthquakes…..Earthquakes…..– Caused by the Caused by the

movement of movement of tectonic plates. tectonic plates. Most common Most common around fault around fault (break in (break in Earth’s surface Earth’s surface where where movement can movement can occur).occur).•Ex. San Ex. San

Andreas FaultAndreas Fault

THINK ABOUT THIS……THINK ABOUT THIS……• Two cars driving Two cars driving

VEEERRRRYYYYY VEEERRRRYYYYY SLLLOOOWWW bump into SLLLOOOWWW bump into one another. Do the one another. Do the passengers in the car feel passengers in the car feel the bump?the bump?

• DUHHHH. Now multiply DUHHHH. Now multiply the size of those cars by the size of those cars by 100,000 (tectonic plates). 100,000 (tectonic plates). Will the bump feel larger Will the bump feel larger or smaller?????or smaller?????

VolcanoesVolcanoes

• FORM:FORM:– When two plates push together and one When two plates push together and one

goes up and the other goes down. Lower goes up and the other goes down. Lower plate melts into magma.plate melts into magma.

• KINDS OF VOLCANOESKINDS OF VOLCANOES– Shield volcano, cinder-cone mountainShield volcano, cinder-cone mountain

• SHAPED EARTHSHAPED EARTH– Add land when the lava cools and Add land when the lava cools and

hardenshardens

THINK ABOUT THIS……THINK ABOUT THIS……

• Water on the Water on the stove…stove…– Water gets hotter Water gets hotter

andand

hotter (tectonic plate)hotter (tectonic plate)

until it…….until it…….

BOILS!! (volcanic BOILS!! (volcanic eruption)eruption)

EARTH’S SURFACEEARTH’S SURFACE

• WeatheringWeathering– Process of breaking up rocks into smaller Process of breaking up rocks into smaller

pieces called sediment.pieces called sediment.– Caused by wind, water, ice, plants, Caused by wind, water, ice, plants,

heating/coolingheating/cooling– Wind and water are major forms of Wind and water are major forms of

weatheringweathering

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• Erosion:Erosion:– Process of moving sediment from one Process of moving sediment from one

place to anotherplace to another

• DepositionDeposition– Process of dropping sediment into a new Process of dropping sediment into a new

locationlocation– Deposits add to the floodplain (the land Deposits add to the floodplain (the land

next to a river)next to a river)

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People Shape the LandPeople Shape the Land

• People use floodplains for farmingPeople use floodplains for farming– Settle near water…..why?Settle near water…..why?

• Reshape waterwaysReshape waterways– Ex. Building dams, creating lakesEx. Building dams, creating lakes

• Direct water into dry placesDirect water into dry places– IrrigationIrrigation

How else do people affect the shape of How else do people affect the shape of the land??? P. 25the land??? P. 25

GROUP QUESTIONSGROUP QUESTIONS

• HOW DO PLATE TECTONICS CHANGE THE HOW DO PLATE TECTONICS CHANGE THE SHAPE OF THE LAND? (3 WAYS)SHAPE OF THE LAND? (3 WAYS)

• HOW DOES WEATHERING AFFECT THE LAND?HOW DOES WEATHERING AFFECT THE LAND?

• WHATS THE DIFFERENCE BETWEEN EROSION WHATS THE DIFFERENCE BETWEEN EROSION AND DEPOSITION?AND DEPOSITION?

• HOW DO VOLCANOS CHANGE THE LAND HOW DO VOLCANOS CHANGE THE LAND AROUND THEM?AROUND THEM?