An animal foetus in the earliest stages of development - in humans, in the first eight weeks after fertilisation.
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To vary from one extreme to another, generally with a regular interval.
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Sound-like waves that travel through the ground from an earthquake or other source of vibration.
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In digestion, absorption is the movement of nutrients and other food chemicals from the gut into the bloodstream, which takes place in the small intestine.
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Also called a conservative boundary, a region where two tectonic plates slide against each other.
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The position on the Earth's surface directly above the point at which an earthquake originates.
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The spreading of the seafloor around mid-ocean ridges as new rock is formed in between two tectonic plates.
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A force acting between magnets or moving electric charges.
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Wave-like muscle contractions, such as those used to move food through the digestive system.
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Believed to make up most of our Universe, we cannot see dark matter, and nobody knows what it is.
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The theory that the continents are not fixed in place but move around the planet.
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Opposing pairs of muscles that move the same bone in opposite directions.
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The spread of particles from an area of high concentration to an area of low concentration.
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Or, movement. In physics, motion is a change in position in space, over time.
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The frictional force exerted on a moving object by air.
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The ability of bacteria to survive exposure to an antibiotic, often by producing a protein that disables or prevents transport of the antibiotic into the cell.
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The process that takes place when two tectonic plates collide together, and one is pushed under another.
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The random movement of small, visible particles suspended in a liquid or gas, when viewed under a microscope.
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A change in the observed frequency of a wave when it is emitted from a moving object and observed from a stationary point, or vice versa.
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A fixed place within the mantle or oceanic lithosphere where rocks melt to generate magma.
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Boundaries where the Earth's tectonic plates meet, where crust can be made, destroyed, and deformed as adjacent plates move.
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Discover how different wavelengths allow scientists to measure the distance to the stars.
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Physics - Universe - L
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The change in direction of a wave caused by its change in velocity, as it moves from one medium into another.
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The force experienced by a current-carrying wire when placed within a magnetic field.
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