Which of the following is a scientific theory related to Earth Science? (mark all appropriate options) Select one or more:
a. Big Bang Theory
b. Plate Tectonics
c. Theory of Relativity
d. Giant Impact Theory

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen