How does the energy of the sun reach earth?

a) subduction
b) conduction
c) fractionalization
d) radiation
e) convection

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

How is the carbon cycle related to global warming ?