What is used to determine the relative age of two rocks? Question 4 options: a) Vertical position b) the presence of unconformities in the rocks c) radioactive dating of each layer d) relative age cannot be determined

Which phrases describe oxygen's roles in earth’s atmosphere? check all that apply. allows fuels to burn forms clouds that produce rain is the gas that animals breathe is used by plants to produce food forms ozone that absorbs the sun's harmful rays