Which concepts are included in uniformitarian theory? erosion and deposition are currently very fast. erosion and deposition are currently very slow. the earth's crust has been formed by numerous local floods. the earth's crust has been formed by a major cataclysm. the earth's crust has been formed by current slow processes. the earth's crust must be relatively young. the earth's crust must be very old. major catastrophic processes are impossible. major catastrophic processes are possible. (choose all that apply)