A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt.
A volcano is a mountain or hill with an opening. When a volcano erupts, magma is pushed up through the opening with great force. When magma reaches the Earth's surface, it is called lava. Lava can be as hot as 2,200°F (1,204°C).
Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface. Volcanic eruptions can last days, months, or even years.
Put simply, a volcano is an opening in the Earth's surface. Usually found in a mountain, the opening allows gas, hot magma and ash to escape from beneath the Earth's crust.
A volcano is a type of mountain that caves downwards to a pool of molten rock, which is below the Earth's surface. During a volcanic eruption, pressure builds up underground due to the formation of magma, which is molten rock mixed with gas.
A volcano is a vent from which a combination of melted rock, solid rock debris and gas erupts. It has a reservoir of molten material below the surface (magma chamber) called magma, and when this magma rises to the surface, it is called lava.
A volcano is a vent in the Earth's crust. Hot rock, steam, poisonous gases, and ash reach the Earth's surface when a volcano erupts. An eruption can also cause earthquakes, mudflows and flash floods, rock falls and landslides, acid rain, fires, and even tsunamis.
Volcanic eruptions happen when gas bubbles inside magma, or hot liquid rock, expand and cause pressure to build up. This pressure pushes on weak spots in the earth's surface, or crust, causing magma to exit the volcano.
A volcano is a mountain from which hot melted rock, gas, steam, and ash from inside the Earth sometimes burst. The volcano erupted last year killing about 600 people. Etna is Europe's most active volcano.
5 Interesting Facts about Volcanoes for Kids
There are more than 1500 active volcanoes on Earth. There are also more than 80 volcanoes under the ocean, although these are just the ones that have been discovered. The 'Ring of Fire' is an area of the Pacific Ocean that is shaped like a horseshoe.
On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.
There are about 1,350 potentially active volcanoes worldwide, aside from the continuous belts of volcanoes on the ocean floor at spreading centers like the Mid-Atlantic Ridge. About 500 of those 1,350 volcanoes have erupted in historical time.
A volcano is defined as an opening in the Earth's crust through which lava, ash, and gases erupt. The term also includes the cone-shaped landform built by repeated eruptions over time.
Volcanoes are constructed this way mainly of two materials: lava and ash. Both of these volcanic products come in many different variations and different volcanoes have different proportions of them.
Since there are on average between 50 and 60 volcanoes that erupt each year somewhere on Earth (about 1 every week), some of Earth's volcanoes may actually erupt within a few days or hours of each other.
A volcano is a type of mountain that caves downwards to a pool of molten rock which is below the Earth's surface. Pressure builds up underground due to the formation of magma which is molten rock mixed with gas. The pressure causes gases and rock to shoot up through the opening and spill over with lava fragments.
More than 80% of the earth's surface is volcanic in origin. The sea floor and some mountains were formed by countless volcanic eruptions. Gaseous emissions from volcano formed the earth's atmosphere. There are more than 500 active volcanoes in the world.
Step 1: First, place an empty plastic bottle in a mound of sand. Step 2: Use a funnel to add some baking soda to the bottle. Step 3: Mix some food coloring and vinegar together and pour this mixture inside the bottle and watch your volcano erupt!
The temperature of the lava in the tubes is about 1,250 degrees Celsius (2,200 degrees Fahrenheit).
Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”
We'll start with perhaps the most confusing of these terms: “active.” Most volcanologists would say that a volcano or volcanic field that has erupted within the Holocene (the current geologic epoch, which began at the end of the most recent ice age about 11,650 years ago), or that has the potential to erupt again in ...
The oldest volcano in the chain is the inactive volcano Meiji, which is 85 million years old. So to answer your original question, volcanoes have been erupting on Earth for at least the last 4 billion years and were undoubtedly more active in the distant past than they are today.