Which radioactive isotope or isotopes would you use to date each of the following objects? explain each of your choices.
(a)-a 4 billion year old piece of granite.
(b)-a one million year old bed of volcanic ash that contains the footprints of hominids (human ancestors).
(c)-the fur of a woolly mammoth that was recently recovered frozen in a glacier.
(d)-a fossilized trilobite recovered from a bed of sandstone that is about 500 million years old.

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

Which statement is best described as a atom

Listen base your answer to the question on the information below.propane is a fuel that is sold in rigid, pressurized cylinders. most of the propane in a cylinder is liquid, with gas in the space above the liquid level. when propane is released from the cylinder, the propane leaves the cylinder as a gas. propane gas is used as a fuel by mixing it with oxygen in the air and igniting the mixture, as represented by the balanced equation below.c3h8(g) + 5o2(g) → 3co2(g) + 4h2o() + 2219.2 kja small amount of methanethiol, which has a distinct odor, is added to the propane to consumers detect a propane leak. in methanethiol, the odor is caused by the thiol functional group (–sh). methanethiol, ch3sh, has a structure that is very similar to the structure of methanol.what is the correct structural formula for a molecule of methanethiol