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Exploring Content 1: Chapter 1

Content wordsContent 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
Created by: jkeyser