Weathering

What happens to a rock when it weathers?

• It settles out of water that is carrying it.
• It creates a valley.
• It forms a delta.
• It breaks into small pieces.

Abrasion causes

• physical weathering.
• chemical weathering.
• both chemical and physical weathering.
• Neither chemical or physical weathering.

Acid rain causes

• physical weathering.
• chemical weathering.
• both chemical and physical weathering.
• neither chemical or physical weathering.

Tree roots cause

• physical weathering.
• chemical weathering.
• both chemical and physical weathering.
• neither chemical or physical weathering.

Physical and chemical weathering both

• change rocks into new materials.
• dissolve rocks.
• break rocks into smaller pieces.
• require exposure to air.

Physical and chemical weathering differ because

• only chemical weathering produces new materials.
• only physical weathering creates smaller pieces of rock.
• only physical weathering involves water.
• chemical weathering is faster than physical weathering.

These rocks were broken apart from the continuous freeze/thaw of water in the cracks of the rocks. This is an example of:

• ice wedging
• acid rain
• permeability
• abrasion

How might a weathered mountain appear different than an unweathered mountain?

• Weathered mountain would be taller.
• Weathered mountain would be rounder and less jagged.
• Weathered mountain would be more jagged and less rounded.
• Weathered mountain would have no trees.

Weeds growing into the cracks in a sidewalk and the sidewalk begins to crumble is an example of:

• mechanical weathering
• chemical weathering

Exposure to rain and oxygen causes the metal minerals in rocks to rust and fall apart.  This is an example of:

• mechanical weathering
• chemical weathering