This website a natural process The Greenhouse Effect is a natural process that warms the Earth, and, in fact, is quite necessary for our survival. Gases in the atmosphere, like water vapor (clouds), carbon dioxide (CO 2), methane (CH 4), and nitrous oxide (N 2O) act as a natural blanket by preventing the sun's heat energy from radiating back into space, much like a greenhouse traps the sun's energy to warm someone's plants even in the middle of winter.

This website gives a wide variety of information on the issue of climate change in the U.S

It shows what an Eocene is and the time period

A great website for learning about monsoons

A site about sycamore trees.

Shows the definition of igneous rock and examples of them