Answer to Question 1
ANSWER: Stony-iron meteorites make up less than one percent of all meteorites. They consist of nearly equal amounts of magnesium and iron-rich silicate minerals, such as olivine and pyroxene, in a nickel-iron matrix. They probably come from a zone between the deeper, iron-rich parts of a large asteroid and the outer stony parts. Chondrites are stony meteorites that make up 93 percent of all meteorites. They consist primarily of olivine and pyroxene, magnesium- and iron-rich minerals, along with a little feldspar and glass, similar to the overall composition of Earth's mantle. They have densities of approximately 3.3 grams per cubic centimeter. Millimeter-scale silicate spheres called chondrules enclose nickel-iron inclusions within or surrounding the chondrule. Achondrites are stony meteorites that are similar to basalt, a common rock on Earth. They consist of variable amounts of olivine, pyroxene, and plagioclase feldspar.
Answer to Question 2
ANSWER: gravity tractor
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