Acid rain has worn away the features on this statue. What type of weathering is this?

The rocks in this stream have gradually worn down from the water and particles in the water rubbing on them over time (abrasion). What kind of weathering is this?

These plant roots are widening cracks in the rock. What kind of weathering is this?

What is erosion

This freezing water is expanding, causing the crack in the rock to widen (frost action). What kind of weathering is this?

Statue of Liberty has changed colors over time because oxygen has caused the surface of the copper it is made of to change into a new chemical (just like copper pennies turn green). What kind of weathering is this?

Does this show signs of physical or chemical weathering?

Small pieces of rock that have been weathered from a larger rock are known as...