A thermocline is a transition layer between warmer water at the surface of a body of water and the cooler deep water that lies below. It is caused by the effect of the sun on the water, in that it keeps the upper parts of the body of water warm whilst being unable to reach the lower, deeper parts.
The world population now is 7.5 billion people
In the age of exploration.... Prince Henry showed the Portuguese how to navigate by studying the sun and stars until later on, he showed them the compass navigation as the only technology advance which made possible for them.
The world wars and early exploration days of the early 19th and 17ty and 16th centuries
A. The Crust
The Earth's crust is the planet's outermost layer. The Earth's outershell is represented by the crust, which is a hard thin layer.
Dry, hot rock from the deep Earth reacts with water and oxygen on the surface, and it is the responsibility of the Earth's crust. This results in the formation of new minerals and rocks.
