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Glossary results for "H"

habitat

the place where an organism lives

hafnium

a chemical element with the symbol Hf and atomic number 72

hallucinogen

a psychoactive drug that can produce altered states of consciousness, characterized by changes in perception, thought, and mood

hamstring

a group of three muscles in the back of the thigh that help bend the knee and extend the hip

hardness

a measure of the resistance of a material to localised plastic deformation induced by either mechanical indentation or abrasion

harvest

the process of gathering crops from a field or garden

hassium

a chemical element with the symbol Hs and atomic number 108

hatch

the process of a baby animal emerging from its egg

hatchling

a newly hatched animal that has not yet fully developed

hazard

a situation that has the potential to cause harm

head

the part of the body that contains the brain, eyes, ears, nose, and mouth

healthy

a state of physical, mental, and social well-being

heard

to perceive sound with the ears

heart

a muscular organ that pumps blood throughout the body

heart rate

the number of times your heart beats per minute

heat

a form of energy that is transferred from one object to another due to a difference in temperature

heat wave

a prolonged period of abnormally hot weather

height

the distance from the bottom of your feet to the top of your head

Heirich Hertz

a German physicist who is known for his work on electromagnetic waves

heliocentric

means that the sun is at the centre of the solar system

helium

the second lightest element in the universe, after hydrogen

hemisphere

half of a sphere

herb

a plant that has a distinctive flavor and aroma, and that is used for its medicinal properties

herbivore

animals that eat only plants

herpetology

the branch of zoology that studies reptiles and amphibians

Hertha Ayrton

a British engineer and physicist who made significant contributions to the understanding of electricity and mechanics

hibernate

a state of inactivity that some animals enter during the winter to survive cold weather and a lack of food

high pitch

refers to the perceived frequency of a sound

high visibility

the ability to see something easily, especially in low-light conditions or when there is a lot of glare

holmium

a chemical element with the symbol Ho and atomic number 67

homogeneous

means that something is all the same throughout

homo sapien

the scientific name for the human species

horizontal

means that something is parallel to the horizon

hormone

complex chemical messengers that play a crucial role in orchestrating various physiological processes within an organism

horseshoe magnet

a type of magnet that is shaped like a horseshoe

hour

a unit of time that is equal to 3,600 seconds

house

a building that is used for human habitation

humerus

the bone in the upper arm

humid

the air contains a lot of water vapour

hybrid

something that is made up of two different things

hydrogen

the lightest element in the universe

hydropower

a form of energy that uses the power of moving water to generate electricity

hydrostatic skeleton

a type of skeleton that uses water pressure to maintain its shape

hygiene

the practice of keeping yourself clean and healthy

hypothesis

a proposed explanation for a phenomenon