A big collision can also produce another kind of layer, too, by melting and vaporizing silicate rocks, which then condense into sand-grain-size glass spheres known as microtektites.

• 大型撞击事件也会造成另一种地层。矽酸盐岩石熔化与蒸发，随后会凝结成砂粒大小的玻璃珠，称为微玻陨石。