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.
But how much of Earth is waterâhow much water contributes to the actual mass of the planet? This includes not just the surface of the Earth, but inside as well. Scientists calculate that the total mass of the oceans on Earth is 1.35 x 1018 metric tonnes, which is 1/4400 the total mass of the Earth. In other words, while the oceans cover 71% of the Earth's surface, they only account for 0.02% of our planet's total mass.