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angle: Refers to the space between two intersections or the surface, usually measured in degrees, or near it. ash: Lightweight fragments of rocks and glass expelled…

Arctic: The area within the Arctic Circle, characterized by extreme cold temperatures and snow cover for most of the year. The Arctic Highlands make up the…

addiction: According to the National Institute on Drug Abuse, addiction is a complex chronic disease characterized by an uncontrollable urge to use a drug despite knowing…

3-D: Three-dimensional (3-D) is an adjective that describes something with characteristics that can be described in three dimensions: height, width, and length. cancer: Cancer is a…

application: a specific use or function of something. atom: Basic unit of chemical elements. Atoms consist of a dense nucleus containing positively charged protons and uncharged…

atmosphere: The outer layer of gas that surrounds Earth or another planet or moon. atom: The basic unit of a chemical element. An atom consists of…

Amphibians: A group of animals that includes frogs, salamanders, and caecilians. Amphibians have backbones and can breathe through their skin. Unlike reptiles, birds, and mammals, fetal…

Calcium: Chemical element and alkali metal common in Earth’s crustal minerals and sea salts. It is also found in bone minerals and teeth, and plays a…