Which of these is a covalent compound?
A. A1C1 3

B. MgO

C. LiC1

D. CO

According to the tide table below what time of day will the highest tide occur?

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm

Which best term to describe a chemical reaction that absorbs energy from its surroundings? a.thermal conductor b.thermal insulator c.endothermic d.exothermic