Rock salt comes from deposits found around dry lake beds, inland marginal seas and enclosed bays and estuaries. It can also be found in salt springs and underground mines. More »

Rocks come from magma, which is the molten material found within the earth. When magma cools, either above or below the earth's surface, it crystallizes and forms the igneous rocks that can later be changed into metamorp... More »

Sedimentary rocks come from the fragments of pre-existing rocks called sediments. There are three types of sedimentary rocks, each coming from different kinds of sediments. Clastic sedimentary rocks are created from the ... More »

Hydraulic fracturing, or "fracking," is a method used to extract otherwise inaccessible deposits of oil and natural gas by cracking the rock layers it's trapped in. In a typical fracking operation, high-pressure water, s... More » Science Environmental Science Natural Resources

The marine biome is essentially all of the world’s connected salt and brackish waters, including the oceans, seas, coral reefs and estuaries. Most of the planet’s life lives in the marine biome, as it covers approximatel... More »

Rock salt is an evaporite mineral known as halite, which was formed by the evaporation of ancient lakes and seas. Halite is found in sedimentary rocks that form in thick deposits that accumulate over time as water from s... More » Science Earth Science Geology

Freshwater and marine ecosystems interact in coastal ecosystems where the two environments intermingle in mangrove swamps, estuaries and bays among other environments. The mingling of freshwater and saltwater give rise t... More »