Kinds of Volcanoes
How many active volcanoes are in the world?
There are about 1,500 active volcanoes in the world.
What is a volcano?
A volcano is an opening in the crust or outside layers of Earth.
What is a volcanic eruption?
A volcanic eruption happens when magma is forced up through a volcano.
What are hot spots?
Hot spots are places where huge amounts of magma build up in Earth's mantle and often erupt.
What things on Earth have volcanoes helped to form?
Volcanoes have helped to form Earth's surface, mountains and lakes.
What does it mean when volcanoes are active?
When volcanoes are active, they are predicted to erupt again.
What is the deeper layer of Earth called?
The deeper layer of Earth is called the mantle.
What is lava.
Lava is the magma that erupts from volcanoes.
How were the islands of Hawaii formed?
The islands of Hawaii were formed by volcanoes that erupted from a hot spot in Earth's mantle.
What can form from minerals trapped in gas pockets of cooled lava?
Beautiful gems sometimes form from minerals in gas pockets of cooled lava.
What does it mean when volcanoes are extinct.
When volcanoes are extinct, they will never erupt again.
What is the Earth's mantle made of?
The Earth's mantle is made of white-hot rock called magma.
What is the temperature of lava?
The temperature of lava is 2,000 degrees Fahrenheit.
What caused new volcanoes to form and another island to begin?
New volcanoes are formed and another island begins when as the plate moved above the hot spot.
How can volcanoes benefit crops?
Volcanoes can benefit crops because volcanic ash is full of minerals that make soil better for growing plants.
What are scientists that study volcanoes called?
Scientist that study volcanoes are called volcanologists.
What are plates?
Plates are form when Earth's crust is broken into pieces.
What happens when volcanoes erupt?
When a volcano erupts, magma is forced up through a volcano. Poisonous gases inside Earth escape and cooled lava shatters into tiny bits of ash that fall like snow for miles around.
What happens to lava after it erupts from a volcano?
After lava erupts from a volcano it cools and becomes hard rock.
What grows on Mount Vesuvius?
Grapes grow on Mount Vesuvius.
Can volcanoes always be predicted?
No, volcanoes can't always be predicted. Sometimes they surprise volcanologists.
Name 2 ways that volcanoes form.
Volcanoes are formed when Earth's plates separate and a crack opens and magma escapes as lava.
They also form when plates move together and overlap. The bottom plate sinks into Earth's mantle. Rock from the plate melts into magma and is forced to the surface.
How can volcanoes harm nature and people.
Volcanoes can harm people with their poisonous gases because they are dangerous to breathe.
Volcanoes hurt nature because the hot lava burns the plants and trees in its path and even trees miles away can die because the heat dries out their sap.
How do volcanoes form an island?
Eruptions of lava flow onto the ocean floor and cools to become hard rock. The pile of cooled lava gets higher and reaches the ocean's surface which forms an island.
What helped to form Earth's surface billions of years ago?
Volcanoes helped form Earth's surface billions of years ago.