virtual reality - 3D environment created by a computer that a person can interact with in a seemingly real way by using a special equipment, digital divide - wide gap in opportunity between those who have ready access to the internet and computers and those who do not, web application - computer software that can be downloaded from the internet for a particular purpose, monitor - check up on, firewall - part of a computer network designed to block unauthorised access, server - a computer that manages all other computers on a network, drag and drop - move an icon or selected text from one part of a document to another by holding and then releasing a button on your mouse or track pad, scroll - view different parts of a document by using a bar, spreadsheet - computer document generated by a special accounting programme that can show and calculate financial information, font - set of letters that have a particular style and size, hard drive - part of a computer that handles the reading, writing and storage of data on the hard disk, drop-down menu - list of choices which appears on a computer screeb when a person clicks on a menu title at the top of the screen, absolute zero - lowest temperature believed to be possible, boiling point - temperature at which a liquid turns into vapour, kinetic energy - energy of motion, particle - a very small piece of something, molecule - smallest unit of a chemical substance, compound - combination of substances, element - simple chemical substance ehich consists of atoms of only one kind, eruption - sudden explosion, condensation - the process of changing something or being changed from a gas to a liquid, evaporation - The change of water from a liquid to a gas, vapour - a liquid in gas form, ultraviolet - relating to light having wavelengths shorter than visible light but longer than x-rays, erosion - slow wearing away of soil or rock by natural forces, crust - rocky outer layer of the earth's structure, porous - having tiny wholes, voltage - electrical force measured in volts, electrode - point through which an electronic current enters or leaves a battery, filament - very thin thread or piece of metal,

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