Which statement describes a chemical formula such as H2O represent compounds.

Which is not a step in the rock cycle?

What are atoms of the same element with varying number of neutrons

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.