True or false covalent bonds take place between 2 non metal elements

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Which is an example of a population?

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.