as rock cools, it contracts. how could this fact explain the presence of valleys marineris on mars

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

Animals that have thick fur and ae able to store large amounts of body fat live where ?