Rocks from Space
Rocks From Space About 2,000 years ago, meteorites from space crashed to Arizona. The hole that it made was 3/4 of of a mile wide, and it is about 600 feet deep. After it exploded, it left 30 tons of rocks scattered all over the countryside.
Rocks Through Ages
Prehistoric humans used rocks to make tools thousands and thousands years ago. For example axes, sickles, (for harvesting crops) daggers, arrowheads, and more.They also grind stones to make other grains into flour.
Rocks All Around Us
Earth in fact is actually a gigantic sphere made from rocks, it measures nearly 8,000 across and weighs about 6.6 six trillion tons(6.7six trillion metric tons, the part that we live on is called the crust; which is made of rock that is 45 miles thick; the crust at the bottom of the ocean is is extremely thin; it is 3 to 5 miles thick. Beneath crust is a very thick layer called, mantle, which is an extremely hot magma-like rock, it is “so” hot that it melts and forms a soft, yet hot syrup called”magma“, sometimes magma forces it’s way up through earth’s crust which it is now lava, under the mantle earth’s outer core(dense liquid made of minerals called nickel, iron, and sulfur), the very center of the earth(heavy dense solid ball made of nickel and iron).
Rocks and Minerals for Kids 