A skull from an ancient human being has 146C decay rate of 4.0 counts per minute per gram of carbon. The decay rate of 146C in living organisms is 15.3 counts per minute per gram of carbon. Calculate the age of the skull. The half life of 146C is 5730 years.

d. making up measurements to record.

the answer is c.) there is a warm front in region a and a stationary front in region b.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.