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Vocabulary
Exploring Content 1: Chapter 1
Content words | Content definitions |
---|---|
atmosphere | gaseous layer surrounding the Earth |
atom | the smallest part of an element |
the Big Bang theory | The universe began with an explosion of a dense mass of energy. |
carbon dioxide | gas produced when carbon is burned; CO2 |
crust | hard outer layer of the Earth |
galaxy | one of the large groups of stars that make up the universe |
gravity | force that causes attraction to a planet |
helium | gas that is lighter than air: He |
hydrogen | colorless gas; lightest of all; combines with O to make water: H |
inorganic | non-living matter |
membrane | very thin layer of covering material |
methane | gas often burned to give heat: CH4 |
molecule | smallest chemical unit of matter, of 2 or more atoms |
molten core | hot, liquid rock center of the Earth |
nitrogen | gas that forms most of the Earth's air: N |
organic | living, or produced from living things |
oxygen | gas necessary to plants and animals: O |
reducing atmosphere | atmosphere with no free oxygen |
theory | idea intended to explain that is not yet proven true |
universe | all of space, including stars and planets |
accumulate | build up together |
analyze | examine or think about clearly and systematically |
combine | mix or join together |
concentrate | to be present in large numbers |
consist of | made of, to be formed of 2 or more things |
evaporation | water dries up in the presence of heat |
formation | process of development into something new |
fuse | join |
gas | third state of matter, neither solid nor liquid |
hostile conditions | make it difficult for life to exist |
join | put together; combine; fuse |
origin | beginning |
subatomic particle | a part of an atom: proton, neutron, electron |
primarily | mainly, principally |
propose | suggest, as a scientific theory or answer |
react | a chemical substance changes when mixed with another chemical substance |
segregate | separate |
simulate | imitate conditions, as in an experiment |
speculate | to guess without knowing all the facts |
spontaneous | happening without planning or organization |
surroundings | environment |
synthesize | make, manufacture |