![meteor](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggYEp497B-opTzJUmFk4K_3JqJJucxEKs3wEs6GuJtfZrpdhoKIlxnDxHRo8CauEqaLWiX3ROm6uzXFjOUJG5PcNcI3-wEU6LSaoKU0fmJcVEvFqHQ93gDLwN7wbCH_UsFXpQGOMvNBBbu/s200/leonid_meteor_shower_2.jpg)
Why on the moon there are so many crater???
On the Moon, however, there is no atmosphere. So, the meteors won't burn because there is no atmosphere. At last, the meteor will impact the moon surface and cause crater.
There are three basic types of meteorites: iron, stony, and stony-iron
1. Iron Meteorites
Iron meteorites are the easiest to recognize. Why???Because this meteorites are overly heavy for their size, because they have a high proportion of iron. These meteorites come from planetesimal-sized chunks of rock
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Iron meteorite |
2. Stony Meteorites
Stony meteorites resemble ordinary rocks. Consequently, stony meteorites are
much less likely to be found, even though they are much more common than iron
meteorites. Did u know that 95% of the meteorites that fall to Earth are stony meteorites???It's true.
Stony
meteorites have about the same density as ordinary rock,and hence are more difficult to find. Most of these stony meteorites are found in places like Antarctica, or the Sahara desert, where there are few ordinary rocks on the surface.Most stony meteorites contain rounded particles imbedded in the rest of the rock. These lumps are called chondrules and the entire stony meteorite isthen called a chondrite. Carbonaceous chondrites are a special kind of chondrite that contain high levels of carbon and often contain amino acids, the building blocks of proteins.
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Stony-iron meteorite |
The majority of meteorites probably come from the asteroid belt. Asteroids are
large enough to have held the heat of the early solar system for millions of years.
This allowed them to differentiate, so that the iron fell to the center, surrounded by
a thin stony-iron layer, and enveloped in a thick stone ‘‘crust.’’ When two such
objects collide, the fragments consist of lots of stony meteoroids, fewer iron
meteoroids, and a very small number of stony-iron meteoroids. These fragments
spray away from the collision site, and a few of them eventually find their way to
planets. Other sources of meteorites are comets, the Moon, and Mars.
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