Weather
This instrument measures air pressure.
Barometer
The star at the center of our solar system.
Sun
The theory that Earth's crust is divided into moving plates.
Plate tectonics
Fossils are usually found in this type of rock.
Sedimentary
The Earth's interior layer directly beneath the crust.
Mantle
Warm air does this compared to cold air.
Rise
Earth's path around the Sun is called a
Revolution
This type of rock forms from cooled magma or lava.
Igneous
The law stating younger rock layers are found above older layers.
Law of Superposition
This scale is used to measure earthquake magnitude.
Richter Scale
The boundary where a cold air mass meets a warm air mass.
Cold front
The phase when the Moon is completely illuminated.
Full moon
The boundary where two plates collide.
Convergent
Scientists use this radioactive element to date ancient rocks.
Uranium
The percentage of Earth's surface covered by oceans.
This type of cloud is associated with thunderstorms.
cumulonimbus
The force that keeps planets in orbit.
Gravity
The mineral used as the standard for hardness 10 on the Mohs Scale.
Diamond
A gap in the geologic record caused by erosion or non-deposition.
unconformity
This mineral scratches feldspar but is scratched by quartz.
apatite
Winds curve because of this effect caused by Earth's rotation.
Coriolis Effect
The apparent shift in a star's position due to Earth's motion around the Sun.
stellar parallax
The process that breaks rocks into smaller pieces without moving them.
Weathering
The eon in which complex life became abundant.
Phanerozoic Eon
The inferred layer responsible for plate motion.
asthenosphere