Landform Riddles

What kind of landform has very steep sides That were cut by a river's erosion and time?

Which type of landform stretches into the tides; Surrounded by water on three of its sides?

What kind of landform is tallest of all With a spiky top where snow may fall?

This landform is found at the bottom of mountains And very tall hills; it's the low land between them.

Which type of landform is just one of seven? It's a really big place split up into nations.

What kind of landform always runs downhill And can be used to turn turbines that power a mill?

You get to this landform when oceans run dry. They're broad, flat spaces under the sky.

This large body of water is surrounded by land. It's a great place to fish and swim, if you can.

What kind of landform is a huge chunk of water That takes up three-fourths of the Earth, and is salty?

When the wind and the rain wear a mountain away, The mound that is left is this landform, they say.

What kind of landform has a vent at the top, Spews lava and steam and pieces of rock?

To get to this landform, a boat you may ride Since water surrounds it on every side.