These days, the Department of Labor enforces roughly 180 worker protection laws, ranging from pay requirements to parental leave benefits. Other protections are supervised by agencies such as the U.S. Equal Employment Opportunity Commission. Below are some of the key federal protections offered to employees.
About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.
What is the atmosphere made of? Earth's atmosphere consists of a variety of gases, including nitrogen, oxygen, argon and carbon dioxide, along with tiny solid particles such as dust, pollen and plant particles. The atmosphere also contains a small amount of water vapor.