PLS HELP How does the diagram explain ocean currents? Earth's tilt causes uneven heating of Earth which causes currents.

Earth's tilt causes uneven distribution of salt which causes currents.

Earth's tilt causes the ocean to move because of gravity

Earth's tilt and its rotation cause currents

Pls give explanation behind if possible!

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?