Mt. Kilauea's ash cloud was tracked to be moving from east to west towards California state at a rate of 40 km/hr. California is 3970 km away from Hawaii. Using the distance formula, how many hours will it take the ash cloud to reach California from Hawaii? (Distance = Rate x Time)

Which statement is true regarding weathering in dry environments? a) chemical weathering is absent because of a lack of humidity. b) physical weathering is usually more evident than chemical weathering. c) it is impossible to identify the type of weathering that has occurred. d) physical weathering does not play a significant role in dry environments.