WHAT DO WE DO WHEN THE EARTH DECIDES TO

CHANGE…

So Much to do…..

Do Now- Write 5 Lines

Describe the following problem through the theme of interaction.

Information

Chapter 2-3 Internal forces - will be due today MIRPL Assignment - coming this week Progress reports entered - missing assignment – do nows, class work, latitude and longitude

Is your ID on?

Current Events: World

More bodies from Japanese volcano eruption

- no lava flows at this time - more activity to follow

Protests in Hong Kong - prodemocracy movement - China cracking down on protests

Do Now- Write 5 Lines

Describe the following problem through the theme of interaction.

Plate Tectonics

Plate Tectonics

Plate Tectonics

Plate Tectonics

Richter Scale

Way to measure strength of earthquakes

- we feel a 2.0 - more severe at 4.5 and above Strongest in Chile, 1960 - measured 9.5 Indonesia, 2004 - 9.1 magnitude - large Tsunami, killed

thousands

Tsunami

Caused by earthquakes - occur in the ocean Giant wave of water - can top 100 feet high - speeds up to 450 mph Creates total destruction - Indonesia, 225,000 killed - 1.2 million displaced

Volcanoes

3 types of volcanoes - Composite, Cone,

Shield Occur along plate boundaries Extremely

destructive Create new

landforms - island formation - land masses,

mountains

T-P-S:

Can internal changes on the earth affect

human advancement?

Explain your answer.

Weathering

Physical and chemical process that occurs over a long period of time

Mechanical Weathering- physical forces that break rock into smaller pieces- does not change rock the “stuff” in a rock, only makes it smaller in size, breaks into pieces

- ex. Ice forms in cracks of rocks and causes them to break

Weathering

Chemical Weathering- the “stuff” in a rock is changed chemically- creates a new composition- the “stuff”, minerals, react with water or air

- ex. Iron in rock rusts from air and water, rock changes and crumbles

Erosion

Occurs after weathering, mechanical process that moves materials- occurs by using wind, water, ice, and gravity- rock materials (sediment) is moved to another location

Question: How does “dirt” from Lancaster County end up in the Chesapeake Bay?

T-P-S: Questions to answer at your table

How does water erode the surface?

How is ice (glaciers) a powerful form of erosion?

Wind as a form of erosion, how?

Gravity as a form of erosion, how?

Water Erosion

Rivers and Streams (Type 1)- moves material downstream- stronger currents move more material

Abrasion- rock is ground by particles (sediment)- faster water equals more grinding

Dissolving- chemical breakdown of material in water

Water Erosion

Erodes both horizontally and vertically- rivers become wider and deeper

As the river slows…- particles drop out of the water- Delta formation at the end of a river

Beaches- increase and decrease- some lose 3ft per year

Wind Erosion

Similar to erosion by water- wind picks up material and moves it- can be abrasive – think about dirt blowing in the air

New land features- sand dunes

Loess- sediment deposits- very fertile soil

Glacial Erosion

Erosion by glaciers (ice)

As a glacier moves…- picks up material and transports it like a river- pieces left behind or deposited in new locations- glaciers move because of gravity

Glaciers cut grooves in rocks- grind rocks- leave behind various other particles and features

Soil formation

Weathering and erosion create soil- moved sediment becomes soil- amount of biological material called Humus

Soil Factors- Parent material – stuff the soil is made from- Relief – steep slopes produce less soil- Organisms – plants and critters (worms, bacteria)- Climate – affects soil types, cold v. hot- Time – amount of time to produce soil (long process)

TOTD

In what ways does erosion affect the lives of humans?

What are the three types of eroding action by water?