2024 Mid-Term Vocabulary

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Nebula

Back

A rotating cloud of gas and dust from which the sun and planets formed.

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Biosphere

Back

The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.

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Radioactive Decay

Back

The process by which an unstable atomic nucleus loses energy by radiation.

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Proton

Back

A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge.

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Outer Core

Back

A molten, liquid iron that surrounds the center of the Earth and creates Earth’s magnetic field.

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Galaxy

Back

A system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

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Solar System

Back

The gravitationally bound system comprising the Sun and the objects that orbit it, including planets, moons, asteroids, and comets.

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Equinox

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The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length.

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Neutron

Back

A subatomic particle found in the nucleus of an atom, with no electric charge.

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Electron

Back

A subatomic particle with a negative electric charge, found in the outer regions of an atom.