Indicate the number of significant figures in 6545

List four observations that indicate that a chemical reaction may be taking place

How do temperature and salinity affect deepwater currents? as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?