A student wants to make a model of ocean currents. She divides a long glass tank in half, as shown below. She puts fresh water in one side and salt water in the other side.
fresh water
salt water
Next, the student removes the barrier between the two sides. Which diagram correctly shows the flow of the water when the barrier
is removed?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this