Learn about the chemical composition of air. See the gases in air and their percentages.
Geology
A crystal is a form of matter in which the atoms, molecules, or ions are arranged in a highly ordered three-dimensional lattice. Crystals are also called crystalline solids because most crystals are solid. However, liquid crystals also exist. The word “crystal” comes from the Greek word krustallos, which means both […]
What Is a Crystal? Definition and Examples
Volcanic lightning is an electrical discharge produced by a volcanic eruption. Because the static electricity is produced in an ash plume rather than a cloud, volcanic lightning is sometimes called a dirty thunderstorm. History The earliest historical record of volcanic lightning came from the ancient Roman, Pliny the Younger. He […]
How Volcanic Lightning Works
Most icebergs are white, but they occur in a wide range of colors, including blue, green, yellow, black, and striped. The colors depend on the amount of air in the ice and whether it contains any impurities. Iceberg color changes over time. Exposure to air and sunlight can erode the […]
What Color Is an Iceberg? How Iceberg Color Works
This geology word search contains 30 geology glossary terms and is a great introduction for students along with a bit of fun added to the mix.
Geology Word Search
Earth’s crust contains nearly all of the naturally occurring elements. This table and periodic table shows the relative abundance of elements in the Earth’s crust. Each element is represented by its atomic number, symbol, name, and abundance in milligrams per kilogram of Earth’s crust. Since 1 milligram is one-millionth of […]