Deep ocean currents are driven by density and temperature gradients. Thermohaline circulation is also known as the ocean's conveyor belt (which refers to deep ocean density driven ocean basin currents). These currents, called submarine rivers, flow under the surface of the ocean and are hidden from immediate detection.
The light-colored material is in areas of the Moon called the highlands, which represent the earliest crust on the Moon. Impact cratering shattered this crust and often deformed it, pushing some of it into mountain-high impact crater rims or ejecting it across the surface of the Moon.
The intensity of moonlight varies greatly depending on the lunar cycle but even the full Moon typically provides only about 0.05-0.1 lux illumination. When the Moon is nearest to Earth and viewed at high altitude at tropical latitudes, the illuminance can reach 0.32 lux. The full Moon is about 1,000,000 times fainter than the Sun. The color of moonlight, particularly near full Moon, appears bluish to the human eye compared to most artificial light sources.