Why do volcanoes erupt Commonlit answer key?
[1]The rock inside the planet we live on can melt to form molten turned to liquid by heat 1 rock called magma. This magma is lighter than the rocks around it and so it rises upwards. Where the magma eventually reaches the surface we get an eruption and volcanoes form.
What words do you associate with a volcano?
According to the algorithm that drives this word similarity engine, the top 5 related words for “volcano” are: lava, magma, crater, basalt, and volcanic crater.
What two critical puzzle pieces are missing from the volcanologists data?
NARRATOR: The scientists have taken nearly every measurement available, but two critical pieces of the puzzle are missing: a gas sample from within the volcano’s crater, to compare with gas in Nyiragongo’s fissures—if they’re the same, it would be a sign that the volcano is actually under the city—and a sample of …
What is the crater of a volcano called?
caldera
A caldera is a depression created after a volcano releases the majority of the contents of its magma chamber in an explosive eruption. Without any structural support below, the land around the erupting volcanic vent or vents collapses inwardly, creating the bowl-shaped caldera.
What causes a volcanic eruption *?
Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber. This lighter magma then rises toward the surface by virtue of its buoyancy.
Why do volcanoes erupt text?
Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth’s mantle melts. Melting may happen where tectonic plates are pulling apart or where one plate is pushed down under another. If magma is thick, gas bubbles cannot easily escape and pressure builds up as the magma rises.
How would you describe a volcano in words?
A volcano is an opening in the earth’s crust through which lava, volcanic ash, and gases escape. Beneath a volcano, liquid magma containing dissolved gases rises through cracks in the Earth’s crust. As the magma rises, pressure decreases, allowing the gases to form bubbles.
Why do volcanologists study volcanoes?
Why do Geologists study volcanoes? Volcanologists are looking for igneous rocks so that they can learn more about where these rocks have come from and whether they were formed during a volcanic eruption.
What is the relationship between plate tectonics and volcanic activity?
Most of the world’s volcanoes are found around the edges of tectonic plates, both on land and in the oceans. 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.
What is crater in volcano short answer?
Happy-Face Crater. A crater is a bowl-shaped depression, or hollowed-out area, produced by the impact of a meteorite, volcanic activity, or an explosion.
How are crater lakes formed?
Lakes in calderas fill large craters formed by the collapse of a volcano during an eruption. Crater lakes form as the created depression, within the crater rim, is filled by water. The water may come from precipitation, groundwater circulation (often hydrothermal fluids in the case of volcanic craters) or melted ice.