What two forces influence the movement of earth’s plates? a. magnetism and convection b. convection and gravity c. fluids and temperature d. gravity and solar heat

What do you think car designers do if the damage caused by a crash test is too severe?

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change