How old is the earth. do rocks last forever. how many rocks or on the moon. is it true that the rocks on the moon have been dated to be approximately 4.6 billion years old. is it true that carbon-14 is an isotope used to date fossils that are millions of years old.

answer:

1) how old is the earth? 4.543 billion years

2) do rocks last forever? no because of weathering.

3) how many rocks are on the moon? between 1969 and 1972 six apollo missions brought back 382 kilograms (842 pounds) of lunar rocks, core samples, pebbles, sand and dust from the lunar surface. the six space flights returned 2200 separate samples from six different exploration sites on the moon.

4) is it true that the rocks on the moon have been dated to be approximately 4.6 billion years old? yes.

5) is it true that carbon-14 is an isotope used to date fossils that are millions of years old? carbon-14, the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years, so it decays too fast. it can only be used to date fossils younger than about 75,000 years. this makes it ideal for dating much older rocks and fossils.

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