• 1. Igneous rock is formed from ________ and ______. • 2. Metamorphic rock is formed

from _____ and __________.• 3. Sedimentary rocks form from

_______ and __________.

RAP:

Weathering 1. What is weathering?2. What are the two energy sources

that cause weathering?3. What process can wear down whole

mountain ranges?4. What is mechanical (physical)

weathering?5. What are the agents of mechanical

weathering?

• 1. Weathering is the process of breaking down rocks and minerals into smaller pieces

• 2. The energy sources that cause weathering are the sun’s energy and the Earth’s internal forces

• 3. Weathering can wear down entire mountain ranges.

• 4. Physical or Mechanical weathering is the process of breaking rocks down into smaller pieces by physical force and not changing the composition

Agents of Mechanical Weathering

Agents of mechanical weathering

Abrasion-rocks grind against one

another

Wind-sand blows against rock

Gravity-rock slide bump into each

other rolling down a hill

Biological

Plants-roots grow in cracks

and expand and break rock

Animals-burrow in soil and move

particles around

Frost wedging-

water expands and

contracts

Water seeps into cracks

freezes expands and melts contracts