Science QUESTIONS =)?

Question

1)Describe the kinds of magma, explain the difference between extrusive and intrusive igneous rock. What does the word igneous mean?

2)What is the origin and composition of magma? Who explained the process of crystallization?

3) What role does density play in the structure of the earth and the convection of magmatic material?

4)What elements make up the atmosphere and the earth's crust?

5) Why does the continent float and the ocean floor sink?

I APPRECIATE IT GREATLY ^________^

Answer 1

I would be glad to answer your questions IF you asked only one question in each post.  What you are asking would require a rather large answer.

BTW, if this your homework, which I suspect that it is, try answering some of the questions yourself.  If you do that, you will retain the knowledge much longer and probably make a better grade on the test.

Answer 2

1)Describe the kinds of magma, explain the difference between extrusive and intrusive igneous rock. What does the word igneous mean? Magma is usually clacified by viscosity.  If the magma has a high gas and steam content, it is more viscous and more explosive.  Lava with low gas and water content has low viscosity, therefore much tamer lava/ magma.

The most abundant magma is a melt of silicate composition and this can carry suspended crystals and gases which bubble out in air.

Magmas consolidate at the surface as lava flows (volcanic), or fall as lithic (rock), crystal and/or glass fragments (pyroclastic). Some solidify within the earth (plutonic or subvolcanic rocks).

Intrusive rock is also called plutonic rock, named after Pluto, the Roman god of the Underworld (because Plutonic rock forms beneath the earth’s surface). Extrusive rock is also called volcanic rock, named after Vulcan, the Roman god of fire, because volcanic rock is spewed onto the earth’s surface by volcanic activity which is also named after Vulcan. There it cools becoming extrusive rock.

The term igneous comes to us from the Latin word "Ignis" which means fire

2)What is the origin and composition of magma? Who explained the process of crystallization?

The origin of magma is the mantel composed of molten rock.

explained in 1822 by the French writer Stendhal

3) What role does density play in the structure of the earth and the convection of magmatic material? Higher density sinks and lower density floats for the most part.  

Convection within Earth's mantle is the driving force for plate tectonics. There are actually two convection currents occurring within the Earth. The outer core experiences convective turnover of fluid metals (primarily iron and nickel) which are responsible for the Earth's magnetic field. The movement of metals forms electrical currents, which in turn generate magnetic fields.

As heat from the inner and outer core heat the lower portion of the mantle, a second set of convective currents form. This mantle convection is extremely slow, as the mantle is a thick semi-solid with the consistency of a very thick paste. This slow convection can take millions of years to complete one cycle.

4)What elements make up the atmosphere and the earth's crust? Atmosphere mostly consists of Nitrogen, O2, O3, and Carbon, and you do have traces of argon, sulfur and other gases.

Crust consists of prettymuch what you find on the periodic tabel.  A lot of carbon based rocks.

5) Why does the continent float and the ocean floor sink? The continent is less dense and much thicker than the oceanic crust.  The oceanic crust is thinner and much more dense.  the lower the angle the oceanic crust is being subducted the greater continental uplift you will get and the higher the angle the more volcanic activity you will get because of the extreme pressure in the mantel.