Ocean currents are caused by water's density differences. the density differences in the ocean water are due to different salt concentrations and differences in
a) waves.
b) temperature.
c) plate tectonics.
d) volcanic activity.

50 points! which of the following is an inference? a burning candle is extinguished when it is covered with a jar. the candle burns longer than expected in a jar that has a plant in it. a plant lives longer than expected in a jar that has a burning candle. there is more oxygen in the jar because there is a plant in it.