Caves being formed by acid rain dissolving underground limestone
Glaciers dropping rock and sand to form terminal moraines
A mudslide flowing down a steep hill
Waves dropping sand on the beach
Wind blowing sand from one location to another
A long, deep, narrow outlet of the sea located between mountain valleys
A natural source of flowing water, larger than a stream
A sand hill or ridge formed by the wind; usually in desert regions or near lakes or oceans
The till deposited at the edges of a glacier that forms a ridge
A river that takes a twisting, turning path, like a snake
A sedimentary rock made from the remains of sea animals, which makes up karst terrain
An area of porous limestone where caves and sinkholes are more likely to form
An underground space which is hollowed out by water and which may collapse if the uppermost layer gets too thin
A mineralized growth that forms starting from the ceiling of a cave
A mineralized growth that forms starting at the floor of a cave
Rubbing action (rock against rock or sand against rock) that weathers rock like sandpaper
A flat area of deposited sediment at the place where a river slows and empties into another body of water
Depositing eroded rock and soil in other places
The force that moves rocks and other material downhill
A natural tunnel within an area of solidified lav, through which molten lava once traveled
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The flat area bordering a river, composed of sediment deposited during flooding
Anything in the environment that humans use
The dozen or so plates that cover the surface of the earth and are constantly moving
The thick mass of tough roots at the surface of the soil; keeps soil in place
