Calculate whether the change in Enthalpy for the reaction CH4 plus 2O2 CO2 plus 2H2O

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?