Why are some of the geological time periods not represented in the strata forming the grand canyon? a.)the age of some of the grand canyon's layers is unknown. b.) unconformities resulted in the erosion of some representative layers. c.) during certain times of earth's past, sedimentary layers were not forming. d.)most of the grand canyon's layers are made of igneous and metamorphic rocks.

Match the term with the corresponding definition. 1. mountains 2. geographic position 3. latitude 4. oceans 5. pressure 6. land vs. water a. affects temperature by influencing the seasonal range of solar intensity b. despite being at similar latitudes, continental locations have a larger seasonal range in temperature than waterfront locations c. local topography predict temperature and precipitation d. thinner air less able to hold heat makes climate colder e. sea surface temperature influences air temperature and evaporation rates f. affects temperature, moisture, and storm tracks