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 Phases of the Moon. Half of the Moonâs surface is always illuminated by sunlight. However, just how much of that light we can see from our point of view on Earth varies every day and this is what we refer to as a Moon phase. The 7 visible Moon phases. The 7 visible Moon phases are pictured here. The New Moon cannot be seen from Earth. Â©bigstockphoto.com/Kagenmi. Sun Lights Up the Moon. The Moon does not radiate its own light, but the Moon's surface reflects the Sunâs rays. Primary and Intermediate Phases. In Western Culture, we divide the lunar month into 4 primary and 4 intermediate Moon phases. Technically, the primary Moon phases occur at a specific moment in time, and the intermediate Moon phases take up the time in between. Opposite phases on the far side of the Moon. New Moon