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Browse key terms and definitions across all GCSE subjects. Search by keyword or filter by subject and exam board.
23,110 key terms
Hazard
Something with the potential to cause harm, such as moving traffic or slippery rocks.
Hazard
Something with the potential to cause harm.
Hazard
Something with the potential to cause harm, such as a corrosive chemical, a flame, hot glassware or a sharp edge.
Hazard
Something with the potential to cause harm.
Hazard
A substance, object or situation that could cause harm, such as a corrosive chemical or hot apparatus.
Hazard
Something with the potential to cause harm, such as damaged equipment or a slippery surface.
Hazard
Something with the potential to cause harm, such as a sharp blade or rotating drill bit.
Hazard management
Actions that reduce the harm caused by a natural hazard, including preparation, emergency response and long-term planning.
Hazard map
A map showing areas threatened by a hazard, used to guide development and emergency preparations.
Hazard mapping
The use of historical events, monitoring and information about the landscape to identify areas threatened by a hazard.
Hazard mitigation
Actions taken to reduce the harmful effects of a hazard, such as evacuation planning and stronger shelters.
Hazardous material
A material that can harm people or the environment under particular conditions of exposure, handling or disposal.
Hazard perception
How someone understands and judges a potential danger; this may differ from the risk indicated by other evidence.
Hazard pictogram
A symbol on a chemical label that warns that the contents may harm people or the environment.
Hazard response
An action taken to prepare for a hazard, protect people from it or deal with its consequences.
Hazard risk
The likelihood of people suffering harm or loss from a hazard, taking account of their exposure and vulnerability.
Hazard symbol
A pictogram used to warn people about the dangers associated with a substance.
Hazzan
A cantor who leads the congregation in prayers, which may be spoken, sung or chanted.
HBCU
A historically Black college or university in the United States, with a historical role in educating Black Americans.
hCG
Human chorionic gonadotropin, a hormone that can be detected in urine during pregnancy.
HDI
The Human Development Index: a combined measure of health, education and income, scored between 0 and 1.
H Division
The section of the Metropolitan Police responsible for policing Whitechapel.
Head
The difference in water level across a barrier that allows water to flow through turbines and generate electricity.
Head
The finishing point of a drawn vector, marked by the arrowhead.
Header
Control information added to the beginning of transmitted data, such as addresses or sequence information.
Headland
A piece of high land projecting into the sea or another body of water.
Headland
A projection of land into the sea, commonly formed where resistant rock remains as neighbouring less resistant rock is eroded.
Headline
The title of an article, designed to attract attention and indicate its subject or angle.
Headline
The main heading of a news story, which attracts attention and establishes an angle on the events.
Head of state
The person who formally represents a country and performs its constitutional and ceremonial duties. In the UK, this is the monarch, not the Prime Minister.
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