Mount St. Helen's eruption was 500 times more powerful than an atom bomb; the eruption of Krakatoa was 20 times stronger than that.

Shield volcanoes are formed by fluid, runny lava that hardens to add layers on the volcano.

Fumaroles are holes or cracks near active or dormant volcanos that vent underground gases.

THe Richter Scale measures the magnitude of an earthquake.

Underwater trenches are formed when the edge of a plate is forced under another plate.

The inner core of the planet can be up to 9000 degrees Fahrenheit.

Paramecium move by using tiny hairs called cilia.

Dakota means "friends" or "allies."

Amoebas move by the use of pseudopods, a word which means "false-feet."

Cells are controlled by a central part called the nucleus.