The earth outer layer is called the crust, What is it made of?

2007-09-16 5:49 am
The eath questions~

回答 (9)

2007-09-16 6:58 am
✔ 最佳答案
/4 cup warm water (about 110 degrees)
1 envelope active dry yeast
1 teaspoon sugar
4 cups bread flour
1/2 teaspoon salt
1 1/4 cups cold water
1 tablespoon olive oil
then cover with red sauce and cheese

my daughter keeps trying to sent me away, but they really don't want me there either. and i do not have the kind of money that makes them like you right away.
2007-09-16 5:53 am
land and ocean
2016-11-15 9:41 pm
interior the Earth what's happening interior this 12,seven-hundred km diameter ball we call the Earth? many of the Earth’s inner shape is an 'knowledgeable wager' (in particular from seismology), because of the fact the longest drill we've has merely penetrated 12.6 km – and there’s 6,3 hundred km between us and the centre of the Earth. even with those obstacles, all of us understand that the centre of the Earth is quite warm. We merely ought to drill a small thank you to observe temperature rises of a few 25°C according to km , so in some unspecified time interior the destiny, each and every thing could be so warm that we could strike molten rock like the lava that flows from volcanoes. even even with the shown fact that, consumer-friendly experience tells us that this speedy upward push in temperature we see from floor drilling ought to no longer proceed indefinitely or the centre of the Earth could be warmer than the sunlight. The at present well-known concept of the Earth’s shape is that it has a center (a great inner center and a liquid outer center), a viscous mantle (divided into an top mantle and mantle), and a silicate crust. We have self belief that gravitational charm and melting has properly regarded after the composition of the Earth so as that dense components have been pulled to the middle, leaving lighter factors on the floor to form the crust. The center Recording the quantity of time it takes refracted and contemplated seismic waves generated by ability of earthquakes to commute via diverse layers of the Earth has instructed us lots correct to the variety and site of issues under the crust. for example, S-waves can't bypass for the period of the Earth’s center in any respect, on an analogous time as the variations in seismic speed between layers reason some waves to refract in accordance to Snell's regulation and different waves to mirror like gentle from a mirror. per learn of dense meteorites (aspects of alternative planets), we can quite assume that the Earth’s good center is composed in particular of iron (around 80 p.c.), with small quantities of nickel. The liquid outer center is composed of iron blended with nickel and hint quantities of lighter factors. at recent, we've self belief that convection interior the liquid outer center mixed with the rotation of the Earth motives the Earth’s magnetic container.
2007-09-16 2:58 pm
Oceanic crust is composed (from bottom to top) of massive gabbros, sheeted (gabbro) dikes, pillow basalts and pelagic sediments. Continental crust is much more variable and cannot be generalized, other than to say it is of grano-diorite composition as a whole. A typical continental crust might contain eclogites, granites and gneisses, Paleozoic marine sediments and loose, unconsolidated sediments.
參考: No Wiki, all from my memory of Geology classes I have taken.
2007-09-16 12:45 pm
I like the recipe answer. Poor fellow, soon they'll miss him at the home and come and get him.

Actually, the crust is primarily made of a soft metalloid known as silicon, and oxygen. There is a smattering of other metals (mainly aluminum and magnesium) as well. If you left out all the other elements the crust wouldn't be a whole lot different than what it is now.

Oh, I know, there's quite a lot of calcium and even carbon there, and iron, too. But in the grand scheme of things silicon and oxygen are the mainstays of the crust of Earth.

In terms of rocks, it is a far more complicated story. Sedimentary rocks cover much of the crust. Sedimentary rocks are mainly shale, sandstone, and limestone. The igneous rocks of the crust come in two broad categories, extrusive and intrusive.

Extrusive rocks are formed from magma which gets to the surface, cools and hardens, and forms basaltic (if there is little silicon available in the 'melt') or rhyolitic rocks if silicon is abundant. Intrusive rocks have similar mineral makeup, but because they do not get to the surface they cool more slowly, allowing crystals to grow larger than those of their extrusive cousins, and form gabbroic and granitic rocks (low silicon and high silicon, respectively).

Of course this is a gross oversimplification, but like the elements of the crust, the rocks of the crust wouldn't be a whole lot different than they are, if they were only basalt, rhyolite, gabbro, and granite, with a covering of shale, sandstone, and limestone. Of course, some of these are metamorphosed by heat and pressure later on, forming rocks such as slate and quartzite. Volumetrically, metamorphic rocks are of less importance than the others.
2007-09-16 6:17 am
Iron, Magnesium, silicate rocks, sodium potassium aluminium silicate rocks, and water

According to Wikipedia: http://en.wikipedia.org/wiki/Structure_of_the_Earth
"The crust ranges from 5 to 70 km in depth. The thin parts are oceanic crust composed of dense (mafic) iron magnesium silicate rocks and underlie the ocean basins. The thicker crust is continental crust, which is less dense and composed of (felsic) sodium potassium aluminium silicate rocks. The crust-mantle boundary occurs as two physically different events."

According to Wikipedia: http://en.wikipedia.org/wiki/Structure_of_the_Earthhttp://en.wikipedia.org/wiki/Structure_of_the_Earth
"The interior of the Earth, similar to the other terrestrial planets, is chemically divided into layers. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core."
2007-09-16 6:05 am
top soil, sub soil and bed rock.
2007-09-16 5:55 am
soil and water.....
2007-09-16 6:43 am
i think it is made of metals.


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