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.

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

The best solution for preventing harm to people and pets from severe hurricanes involves determining and warning residents about what

Achemical equilibrium between gaseous reactants and products is shown. n2(g) + 3h2(g) ⇌ 2nh3(g) how will the reaction be affected if the pressure on the system is increased? it will shift toward the reactant side as there is lower pressure on the reactant side. it will shift toward the product side as there is higher pressure on the product side. it will shift toward the reactant side as there are a greater number of moles of gas on the reactant side. it will shift toward the product side as there are a fewer number of moles of gas on the product side.