a force that exists between any two objects that have mass
gravity
a system of objects that revolve around a star
solar system
a pure substance that cannot be broken down into simpler substances by chemical reactions
element
the ordering of sedimentary layers of rock with the oldest on the bottom and the youngest on top
superposition
melted rock located beneath Earth's surface
magma
a compound made of hydrogen and oxygen
water
the study of Earth through the study of rocks, minerals, water, and other Earth materials, as well as through seismic waves and other natural phenomena
geology
a nonrenewable resource formed from organic carbon due to the compression and partial decomposition of organisms
fossil fuels
the innermost layer of Earth, made up mainly of iron and nickel
core
something put together with materials that serves a purpose
structure
the layer of solid rock between Earth’s crust and core
mantle
the layer of rock that forms Earth's surface
crust
to figure out what data or information means
analyze
a drawing, object, or idea that represents a real event, object, or process
model
the large, empty part of the universe that does not contain any matter
space
a large, circular pit in the surface of a planet or other body in space usually formed when two bodies in space collide
crater
Earth's crust, both beneath the oceans and continents, as well as the mantle and inner and outer core
geosphere
the part of Earth which is composed mostly of rocks; the crust and outer mantle
lithosphere
from a time before human history was recorded
prehistoric
a piece of rock or metal from space that strikes Earth's surface
meteorite
minerals in rock that can be extracted and used by people to make things
ore
resources that are obtained from the earth
natural resources
the process of reasoning by drawing a logical conclusion based on factual evidence
inference
the study of the properties and behavior of bodies in outer space
astronomy
the theory that a solar system evolves from a hot gaseous nebula
nebular hypothesis
a length of time
period
a body in outer space that orbits a planet; a natural satellite
moon
a type of rock formed by gravity pressing fragments of other rocks and minerals together as they settle on land or under the ocean over a long period of time
sedimentary rock
the information about Earth's history that can be gathered from fossils
fossil record
a layer or line of rock above or below another body of rock
rock layers