Volcanoes

What is a volcano?

• A volcano is an opening in the earth's crust through which lava, volcanic ash, and gases escape

• A volcano is a mountain in the earth's crust through which water, plants, and animals lived

• A volcano is a house under the earth's crust

• A volcano is an opening in the earth's crust when a meteor strikes

How can volcanic ash damage the environment?

• crop failure

• land covered with ash

• robots malfunction

• poluting rivers

How many

active volcanoes are there today?

• 60

• 700

• 1500

• 150

What are lahars?

• Raining ash

• Mudslides formed when material from a pyroclastic flow merges with the water

• Polluted water that poison the land

• A type of forest fire.

What comes out of the volcano when it erupts?

• hydrogen sulfide

• Lava

• Ash

• sulfur dioxide

How do volcanoes form?

• formed by tectonic plates sliding

• formed by tectonic plates moving under another

• formed by tectonic plates moving next to another

• formed by tectonic plates moving apart from another

What are the benefits of volcanoes?

• volcanic soil is useful and rich in nutrients for plants and crops

• Provide metals like copper, silver, iron, and gold

• It makes haze that covered the area.

• It produces volcanic rock for research

Volcanoes don't create new landforms.

• True

• False

Volcanoes can affect the weather.

• True

• False

Lava flows very slowly. They can start a forest fire.

• True

• False