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What isotope is best for dating very old rocks?
Uranium
Is radiocarbon dating is an effective tool for dating rocks millions of years old?
okay
What is dating used to date ancient rocks millions of years old?
Radiometric
How old is the the earth and how did scientist know?
About 4.5 billion years old - calculated by the radioactive dating of the oldest rocks found AND the dating of even older meteorites.
How do you carbon date rocks 10 million years old?
You cannot. Carbon dating is not useful for dating things more than about 50,000 years old. You would have to use a different radioisotope to date something 10 million years old. Potassium-Argon dating would work for some rocks.
What does relative dating provides?
It provides how old a rock/fossil is compares to the rocks/fossils around them.
Why are sedimentary rocks important to relative dating?
because relative dating gets a really close estimate of how old sedimentary rock is.(the layer of course!)
How have scientists used radioactive dating to show that earth is about 4.6 billion years old?
by defining the age of rocks
What evidence supports the hypothesis that Earth is 4.6 billion years?
Among other things, rocks have been found that are over 4 billion years old. The age of such rocks is determined by radioactive dating. Note that this is not "a" method, but perhaps 40 different methods (depending on the isotopes involved), which complement one another.The exact age of the Earth is harder to determine exactly; but basically, it must be at least as old as the oldest rocks found.
What two methods of radiometric dating are used for rocks more than 10 million years old?
what are two radio active isotopes that are usful for dating rocks that are older than ten million years
What is the name for a very old fossil in sedimentary rocks?
stromatolite
What evidence is given to tell how old the moon is?
Using standard radiometric dating of rocks returned from the Moon by the Apollo missions.
