How do two types of weathering work together to break rock?

Question

Please help me answer this question! I've got a test tomorow and this question is in it. Thanks :)

Answer 1

Ok best guess - Wind and rain.

Wind creates current.  Rain builds up and creates lakes.  Together they bash on rocks to make sand/mud/dirt, eventually the grand canyon.

Answer 2

The action of plants growing roots, and of ice opening the crack a bit more for the roots to go further, then the crack fills with water and freezes.

Answer 3

Well, if a rock is in a river, the water is causing chemical weathering and the rock hitting other rocks, causing it to fracture and crumble are examples of mechanical weathering.

Answer 4

Rain, and moving water can weather rock.

Water getting into cracks, expanding and freezing will crack rocks and break them.