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Moon phase

change in appearance of the Moon as viewed from the Earth, due to the relative positions of the Moon, Earth, and Sun

The planets

mercury, venus, earth, mars, jupiter, saturn, uranus, neptune


something that may increase or decrease (like the tides of the sea)

Igneous Rock

rock formed by the solidification of molten magma


rock that in its molten form (as magma) issues from volcanos


Positively charged particles


the particles of the nucleus that have no charge

Continental drift

the gradual movement and formation of continents (as described by plate tectonics)


the geographical area under the jurisdiction of a sovereign state

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