Rain that is more acid than usual, below about pH 5.6.
A base that dissolves in water.
A mixture of metals, or of a metal and carbon.
A solid chemical that reacts with an acid to form a salt and water.
When rocks are broken up or dissolved by chemical reactions, usually involving rainwater.
Squeezed by weight above.
Artificial stone made from a mix of cement, water and larger pieces of material such as gravel, stones or sand.
The amount of mass that 1 cm3 of a material has. Denser materials are 'heavier' than less dense ones.
When moving air, water or ice drops rock fragments or grains (sediment) it has been carrying.
How easily a material is drawn out into a thin wire without breaking.
The movement of loose and weathered rock.
The arrangement of rocks in the ground.
Rock made from interlocking crystals that are not in layers. Formed when molten rock freezes.
How easily a material is hammered or rolled out into a sheet without breaking.
Elements that are shiny, conduct heat and electricity well, and often have high melting and boiling points.
Rock made from interlocking crystals that are usually lined up or in layers. Formed by the effects of temperature and/ or pressure of other types of rocks.
A substance containing two or more different substances that are not chemically joined.
A reaction between an acid and a base (or alkali) that makes a solution with a pH of 7. A salt and water are produced.
Elements that are not shiny, and do not conduct heat and electricity well. They often have low melting and boiling points. The solid ones are brittle.
Resource that will eventually run out, such as quarried stone.
Rock that contains a metal compound from which the metal can be extracted.
When rocks are worn away or broken up by physical processes, such as changes in temperature.
Containing tiny holes that a liquid can soak into.
Something that is used to describe how a material behaves and what it is like. Strength is a property of some solids.
A material used to make something else, such as a metal ore that the metal is extracted from.
When an object is used again, without being broken up or recycled.
Use a material again, often by melting it and using it to make new objects.
Does not bend easily.
All the processes which form sedimentary, igneous and metamorphic rocks linked together.
Iron oxide - a flaky, red compound formed when iron reacts with oxygen.
A compound formed by the reaction of an acid and a base (or alkali). It has a metal part and a non-metal part. The non-metal part is usually chloride, sulphate or nitrate (e.g. potassium sulphate).
Rock grains and fragments that sink to the bottom of a river, lake or sea.
Rock formed from layers of sediment. It is often porous and made of rounded grains.
An element that has some metallic and some non-metallic properties.
An action that allows things to continue into the future.
A reaction displayed using the chemical symbols of the substances involved.
A reaction displayed in words.