Back to: Science e-catalog Grade 5 e-Glossary M

List of Words for Letter ‘M’

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magma Hot, melted rock below Earth’s surface.
magnetic field A region of magnetic force around a magnet, represented by lines.
magnetic levitation The lifting of an object by means of magnetic forces.
magnetism The ability of an object to push or pull on another object that has the magnetic property
magnitude The amount of energy released by an earthquake.
malleability The ability to be bent, flattened, hammered, or pressed into new shapes without breaking. A nearly melted layer of hot rock below Earth’s crust.
mantle A nearly melted layer of hot rock below Earth’s crust.
marsupial A mammal in which the female has a pouch where offspring develop after birth.
mass A measure of the amount of matter in an object.
matter Anything that has mass and takes up space.
meander A bend or S-shaped curve in a river.
medium Substance through which a wave travels.
melting point The particular temperature at which a substance changes state from a solid to a liquid.
metal Any of a group of elements that conducts heat and electricity, has a shiny luster, and is flexible.
metamorphic rock A rock that forms from another kind of rock under heat and pressure.
metamorphosis A series of distinct growth stages that are different from one another.
meteor A chunk of rock from space that travels through Earth’s atmosphere.
mimicry An adaptation in which an animal is protected against predators by its resemblance to another, unpleasant animal. A solid, nonliving material of Earth’s crust with a distinct composition.
mineral A solid, nonliving material of Earth’s crust with a distinct composition.
mixture A physical combination of two or more substances that are blended together without forming new substances.
molecule A particle that contains more than one atom joined together.
momentum The mass of an object multiplied by its velocity. An angiosperm with one cotyledon in each seed.
monocot An angiosperm with one cotyledon in each seed.
monotreme A mammal that lays eggs.
moon A natural object that orbits a planet. A change in an object’s position over time.
motion A change in an object’s position over time.
multicellular Many-celled organism.
muscular system The body system made up of muscles that move bones.
mutualism A relationship between two kinds of organisms that benefits both.