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Glossary results for "N"
narwhal
large, toothed whales that live in the Arctic Ocean
natural
not made by humans
natural disaster
a natural event that causes widespread damage or loss of life
naturalist
someone who studies and loves nature
natural sciences
the branches of science that study the natural world
natural selection
the process by which organisms with favorable traits are more likely to survive and reproduce, passing on those traits to their offspring
neanderthal
a species of hominin that lived in Europe and parts of Asia from about 400,000 to 40,000 years ago
nectar
a sweet, sugar-rich liquid produced by flowers
neodymium
a chemical element with the symbol Nd and atomic number 60
neon
a chemical element with the symbol Ne and atomic number 10
Neptune
the eighth and farthest planet from the Sun in our solar system
neptunium
a chemical element with the symbol Np and atomic number 93
nerve
a bundle of nerve fibers that conducts electrical signals between the central nervous system (CNS) and the peripheral nervous system (PNS)
net zero
a term used to describe the balance between greenhouse gas emissions and removals
neurodegenerative
the progressive loss of neurons, or nerve cells, in the brain and other parts of the nervous system
Newton
the SI unit of force
Newton meter
a unit of torque
nickel
a chemical element with the symbol Ni and atomic number 28
Nicolaus Copernicus
a Polish astronomer best known for his heliocentric model of the universe
Niels Bohr
a Danish physicist best known for his work on the structure of the atom
nihonium
a synthetic chemical element with the symbol Nh and atomic number 113
Nikola Tesla
an inventor and electrical engineer known for his work on electricity and technology
niobium
a chemical element with the symbol Nb and atomic number 41
nitrate
an ion with the chemical formula NO3-
nitrogen
a chemical element with the symbol N and atomic number 7
nobelium
a synthetic chemical element with the symbol No and atomic number 102
non-absorbent
a material that does not allow fluids or other substances to pass through it
non-contact force
a force that is exerted on an object without the two objects actually touching
non-magnetic material
a material that does not have any magnetic properties
non-newtonian fluid
a fluid whose viscosity, or thickness, changes with the force applied to it
non-renewable energy
energy that cannot be replenished in a human timescale
Northern Hemisphere
the half of the Earth that is north of the equator
nose
the organ in the face that is responsible for smell
nose hair
the tiny hairs that grow inside your nose
nostril
one of the two openings in the nose that allow air to enter
November
the 11th month of the year in the Gregorian calendar
nucleus
contains the cell's DNA
nutrition
the science of how our bodies use food for energy, growth, and repair
nutrition label
a label that is put on food products to tell you about the nutrients in the food