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| active |
When animals or people are active, they are not resting or sleeping. If a volcano is active, things are happening inside it, and it could erupt at some time. [1/2 definitions] |
| basalt |
Basalt is a heavy, dark-colored rock made by volcanoes. It is the main type of rock found along the bottom of the ocean. You can see basalt forming when lava flows down a volcano and cools. |
| crater |
a hollow area shaped like the inside of a bowl. The mouth of a volcano is a crater, and the moon has many craters on its surface. |
| dormant |
If a volcano is dormant, it is not active now, and it has not erupted in many years. [1/2 definitions] |
| erupt |
of a volcano, to break open and send out hot melted rock and ash. [1/2 definitions] |
| eruption |
When there is an eruption, something breaks open and material comes out. If there is an eruption of a volcano, there is an explosion inside it. The mountain breaks open and lava pours out. |
| extinct |
When a volcano is extinct, it is not active anymore. It will not explode again. When a fire is extinct, it is no longer burning. [1/2 definitions] |
| igneous |
having to do with rocks formed by a volcano or other source of great heat. |
| lava |
hot, melted rock that erupts from a volcano. [1/2 definitions] |
| magma |
hot, liquid matter beneath the earth's surface that cools to form igneous rock. Magma that reaches the earth's surface, as when a volcano erupts, is called lava. |
| tsunami |
a very large, often destructive, sea wave that is caused by an earthquake or explosion of a volcano under the ocean. |
| volcanic |
of, characterized by, or relating to a volcano or volcanoes. |
| volcano |
A volcano is a mountain made from hot, melted rock that has come up from deep inside the earth. A volcano begins with an opening in the earth's crust made by force from underground. Then, with an explosion, hot melted rock is thrown into the air through this opening, along with lots of smoke, ash, small rocks, and gases. Volcanoes build up over thousands of years with repeated explosions. Most of the time, nothing is happening inside a volcano. The mountain may have trees and plants growing all over it. It is like it is sleeping--maybe for thousands of years-- but sometimes a volcano becomes active. When a volcano becomes very active, it can explode and pour out the hot, liquid rock that eventually cools and adds to the size of the volcano. |
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