If half of a radioactive isotope decays in one hour, how much of the original isotope will remain after three hours?

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

What causes most sediment to wash or fall into a river