Environmental Chemistry Crossword Puzzle

QUESTIONS LIST:

• hydrocarbon : a compound containing hydrogen and carbon only.
• exothermic reaction : a reaction in which energy is transferred from the reactants to the surroundings. the temperature of the surroundings increases.
• recycling : using a material again, often by melting it and using it to make new objects.
• landfill : large area in which rubbish is left.
• global warming : increased warming of the earth’s surface as a result of increased amounts of carbon dioxide and other greenhouse gases in the air.
• endothermic reaction : a reaction in which energy is transferred to the reactants from the surroundings. the temperature of the surroundings decreases.
• ore : a rock that contains enough of a certain mineral or metal to make it worth mining.
• greenhouse gas : a gas, such as carbon dioxide, water vapour or methane, in the earth’s atmosphere, which absorbs energy emitted from the earth’s surface and then emits it back to the surface.
• pollutant : a substance that can harm the environment or the organisms that live there.
• sulfur dioxide : an acidic gas released from burning fossil fuels, which contributes to acid rain.
• acid rain : rainwater that is more acidic than usual due to air pollution, usually caused by sulfur dioxide and nitrogen oxides dissolved in it.