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Magma is molten rock beneath the earth, usually with some trapped gasses in it. The composition of magma varies, but the most abundant compounds include:
Silica (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO), sodium oxide (Na2O), magnesium oxide (MgO), potassium oxide (K2O), and iron oxide (FeO and Fe2O3). Trapped gasses, which make up a smaller proportion include water (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2).
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What best describes the composition of the magma that erupts at Mount Pinatubo in the Phillippines?
The magma that erupts at Mount Pinatubo is mainly dacitic in composition, which is a type of intermediate magma that is rich in silica. This type of magma typically leads to explosive eruptions due to its high viscosity and gas content.
What statement best describes an igneous intrusion?
An igneous intrusion is formed when molten rock (magma) is forced into preexisting rock and solidifies underground. Over time, the surrounding rock erodes away, exposing the igneous intrusion at the Earth's surface. Intrusions can take various shapes and sizes, such as dikes, sills, and laccoliths.
What feature in igneous rocks is the best indication of how rapidly the magma crystallized?
The size of the crystals. Large crystals mean the magma cooled slowly, small crystals are a sign that the magma was cooled quickly.
What is the term that best describes seawater?
Saline.
Which statement presents the best evidence that a boulder-sized rock is an erratic?
A boulder-sized rock composed of a different type of rock than the surrounding area is the best evidence that it is an erratic. This indicates that the rock was transported from a distant location by glaciers or other geological processes.
What best describes the composition of the magma that erupts at Mount Pinatubo in the Phillippines?
The magma that erupts at Mount Pinatubo is mainly dacitic in composition, which is a type of intermediate magma that is rich in silica. This type of magma typically leads to explosive eruptions due to its high viscosity and gas content.
Which best describes the composition of the ocean floor?
The ocean floor generally consists of basalt cooled from magma, and the overlying layers of sediment, both inorganic and organic.
What term best describes a mathematical statement?
A conditional statement
What term best describes a mathematical statement of if a then b?
A conditional statement.
What statement best describes what happened to the groups on separate reservations?
They became culturally different from one another.
Which statement best describes Venezuela's economy?
primary
Which statement best describes how the RFID standard works?
lolololololo
What statement best describes the united States?
it is a democracy and a federation
What statement best describes the hardness of the mineral dolomite?
1
What statement best describes William Tecumseh Sherman?
He was a soldier.
What statement best describes mark Antony?
he IS a trusted member
Which statement best describes George Washington?
never belonged
