Slow Changes on Land

The process that causes rocks on Earth's surface to crumble, crack and break it is:

• erosion

• weathering

• glacier

• earth

Weathering usually happens

• quickly

• slowly

Rushing water causes the weathering on rocks on beaches and

• ice

• lakes

• river buttoms

• ponds

Rocks can be worn down by ___________ carrying sand.

• strong rain

• strong wind

Changing temperature can weather rocks too.

• True

• False

Rocks are broken apart by frozen water and _____ the gets into spaces in the rocks.

• plant leaves

• plant branches

• plant roots

Some chemicals can cause the __________ in rocks to change.

• land

• straw

• rocks

• minerals

When the minerals in rocks change, the rocks break.

• True

• False

The first step in the formation of a cave is water entering cracks in _________

• rock

• limestone

• pebbles

A small opening forms when ________ in the water soften minerals in rock.

• weathering

• erosion

• chemicals

• solutions