An HTML tag can be used to define the structure, design, and functions of a webpage. The atmosphere is the envelope of gas that surrounds the Earth, another planet, or the Moon. An atom is the basic unit of chemical elements, consisting of a dense nucleus containing positively charged protons and uncharged neutrons, orbited by a cloud of negatively charged electrons. The term “average” refers to the arithmetic mean of a number group. Action is the way something, often a person or living thing, acts towards others or itself. Carbon is a chemical element that is the physical basis of all life on Earth. It exists as graphite and diamond and is an important part of coal, limestone, and petroleum. Carbon capture is the process of removing carbon dioxide from air or water to store or reuse it. A carbon footprint is the measure of the greenhouse gas emissions from a product. Caustic describes an alkaline substance that can burn or chemically combust, such as lye. Chemicals are substances formed when two or more atoms combine in a certain proportion and structure. Climate refers to weather conditions that exist in an area over a long period of time. Climate change is significant long-term changes in Earth’s climate. A compound is a substance formed by combining two or more chemical elements in certain proportions. Corrosive describes something that can weaken or damage a material as a result of a chemical reaction. A crystal is a solid with a symmetrical, regular three-dimensional arrangement of atoms or molecules. Development can occur naturally or through human intervention. Melting is turning a solid into a liquid. Diversity refers to a wide range of similar items, ideas, or people. Electrical conductivity is the ability of a substance to transport a charge or electric current. Electricity is a flow of charge resulting from the movement of negatively charged particles. An element is the smallest unit of more than 100 substances and is a component of a larger structure. Engineering uses mathematics and science to solve practical problems. The environment refers to everything that exists around an organism or the conditions produced by those things. Fluoride is a chemical substance containing elemental fluorine. Fossil fuels are produced within the Earth over millions of years from the decaying remains of bacteria, plants, and animals. A materials scientist studies how the atomic and molecular structure of a material is related to its overall properties. Mechanical pertains to moving equipment or something caused by the physical movement of another object. A film is a barrier that blocks the passage of substances based on their size or other characteristics. A metal conducts electricity well, is shiny, and malleable. A microscope is used to observe objects too small to be seen with the naked eye. A mineral is a crystal-forming substance that makes up rocks. Melted is used to describe molten material. MXenes are ultra-thin layered synthetic nanomaterials with a planar structure made from alternating layers of atoms. A nanometer is one billionth of a meter. Nitrogen is a colorless, odorless, non-reactive gaseous element that forms approximately 78 percent of Earth’s atmosphere. Oxygen is a gas essential for respiration.
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