Mechanical, Biological and Chemical Weathering

Weathering

Poll

How are we today?

• Happy

• Sad

• Hungry

• Sleepy

How can Earth's Surface change?

• Through Weathering and Erosion

What is Weathering?

• The natural breakdown of Earth's surface

• Physical or Chemical

Physical (Mechanical) Weathering

• Substance breakdown

• Does not effect chemical composition

Chemical Weathering

• Chemical reactions between rocks, the air, and water.

• Water is able to dissolve most minerals.

• Rocks can take YEARS to CHEMICALLY weather!

Multiple Choice

What is Weathering?

• When it rains or snows.

• The movement of rocks or dust.

• Any natural process that changes Earth's surface.

• I have no clue.

Multiple Select

What types of weathering are there?

• Mental

• Physical

• Astronomical

• Chemical

• The rainy type

Multiple Choice

If a rock were to physically weather, what would it do?

• Breaks down over time.

• Grows bigger.

• Turns into ash.

• Becomes invisible.

Multiple Choice

If a rock weathers chemically, what is really happening?

• The rock flies.

• The rock rolls.

• It dissolves.

• It Becomes a liquid.

Open Ended

How was today's class? (Use complete sentences!)