Question | Answer |
Rain that is more acidic than usual (pH less then 5.6) due to high amounts of dissolved acidic gases. | acid rain |
Weathering caused by plants and animals. | biological weathering |
Weathering caused by chemicals. | chemical weathering |
Very fine particles of rock. | clay |
The movement of pieces of rock by the wind, water, etc. | erosion |
A mixture of rotting plant material and animal remains found in soil. | humus |
Calcium oxide (made by roasting limestone or chalk). | lime |
The best soil for growing plants. Mixture of humus, clay and sand. | loam |
A chemical found in rocks. | mineral |
A reaction in which an acid cancels out an alkali. | neutralisation |
A scale which measures how acidic or alkaline a solution is. | pH |
Weathering caused by changes in temperature. | physical weathering |
A soil that contains larger particles than clay soils.Water passes through it easily. | sandy soil |
Depositing of broken up pieces of rock, sand and clay. | sedimentation |
A mixture of rock fragments, humus, air, water and dissolved minerals. | soil |
A mixture of dyes which turns different colours as the pH of a solution changes. | universal indicator |
The break up of rocks into smaller pieces by natural processes. | weathering |
A device fitted to a car’s exhaust to change harmful gases into harmless gases. | catalytic converter |
A slightly acidic gas formed when carbon reacts with oxygen (and during respiration). | carbon dioxide |
The scientific word for burning. | combustion |
A substance that reacts with certain substances and wears them away. | corrosive |
Acidic gases formed when nitrogen reacts with oxygen. | nitrogen oxides |
An acidic gas formed when sulfur reacts with oxygen. | sulfur dioxide |
A device used in power stations to remove sulfur dioxide gas from the gases coming out of the chimney. | sulfur precipitator |
Substances released into the atmosphere which should not be in air. | air pollution |
The gradual increase in mean (average) global temperatures. | global warming |
The Sun’s energy being trapped by gases in the atmosphere, thought to lead to global warming. | greenhouse effect |