Every year, more than 14 billion pounds of garbage is dumped into the oceans of the world, most of which is plastic and toxic to ocean life. Lesson 32 in the series of 36 focuses on environmental concerns, specifically pollution. Under...

Explains what the four spheres of the Earth are, and the interactions between them.

Explains what the four spheres of the Earth are and describes how volcanic eruptions affect the different spheres. Also provides a list of events that are examples of interactions.

Biogeochemical cycles happen when individual elements are recycled over and over in different parts of the Earth. Two examples are the Nitrogen Cycle and Carbon Cycle. Read an explanation of biogeochemical cycles and view a diagram of...

Get a general grasp on the four spheres, five sub-fields, and two scales of physical geography.