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WorksheetsMagma
Total questions: 10
Worksheet time: 4mins
Does the picture show the formation of magma or lava?
Magma because it is formed under the Earth's surface in the upper mantle and lower crust
Lava because it is formed on the Earth's surface
What temperatures are necessary for magma to form?
At the same temperature that water boils, which is 100⁰C
Between 200⁰C and 800⁰C
Between 800⁰C and 1200⁰C
Since magma is a "liquid rock", it must at a temperature similar to our Sun (which is greater than 5,000⁰C)
True or False. The classification of magma is based upon the amount of silica, SiO2
True
False
True or False. Magma is composed of a slushy mixture of molten rock, mineral crystals, and dissolved gases.
True
False
Magma is made of minerals that make up the Earth's crust. Some of these minerals are Aluminum (Al), Iron (Fe), Calcium (Ca), Sodium (Na), Potassium (K), Magnesium (Mg) and:
H2 gas and Sulfur (S)
F2 gas and Argon (Ar)
O2 and Silicon (Si)
Cl2 and Uranium (U)
There are four factors that affect magma formation. They include:
- Temperature
- Pressure
- Water content
What is the fourth?
Weather
Nitrogen content
pH
Mineral Composition
What happens to the pressure the further you go down into the Earth's crust and mantle?
It decreases because there isn't that much rock above to push down (from above)
It increases because the weight of the rock above presses down
As a solid begins to melt, the particles that were previously locked into place, begin to slide past each other.
The deeper you travel into the Earth's crust, the pressure increases. The increased pressure "contains" or "prevents" the molecules from moving. This increased pressure prevents the solid rock from turning into a liquid. In order for the rock to become a liquid, what happens to the melting point?
The melting point of the solid rock must increase so that the particles have enough energy to move past into each other as they convert into a liquid
The melting point decreases because the particles that make up the rock can already move
It has no effect on the melting point
Water has a high specific heat capacity. This means that water can _____
Absorb a lot of heat energy
Absorb very little heat energy
When oceanic crust moves under continental crust in a process called subduction, water is brought down to the mantle. (See picture).
Recalling that water has a high specific heat capacity, as it enters the rock, does it increase or decrease the melting point of the magma?
The presence of water and it's high specific heat capacity, lowers the melting point, allowing magma to form
The presence of water and it's high specific heat capacity, raises the melting point, allowing magma to form
