Fossils in layers of rock are generally estimated to be than fossils found in the upper layers. older, younger newer, younger older, older newer, older

Which one of the following gases is not an important component of soil?

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j

If a gas has an initial pressure of 101kpa and a volume of 10l, then it expands to a volume of 20l, what is the new pressure?