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Tectonic Forces
$200This process occurs when one tectonic plate moves under another and sinks into the mantle.
$400These large-scale cracks in the Earth's crust are where significant seismic activity often originates.
$600This theory describes the large-scale motion of the plates making up the lithosphere.
$800This central point of an earthquake located directly above the hypocenter is known as this.
$1000This term refers to the slow, steady movement of plates relative to each other at spreading ridges.
Atmosphere Basics
$200This lowest layer of the atmosphere is where most weather phenomena occur.
$400This gas makes up approximately 78 percent of the air in Earth's atmosphere.
$600This layer of the atmosphere contains the ozone layer that protects us from ultraviolet rays.
$800This invisible force exerted by the weight of air molecules determines barometric readings.
$1000This transition zone separates the troposphere from the stratosphere.
Mineralogy
$200This term describes the resistance of a mineral to being scratched.
$400This scale ranks minerals based on their scratch resistance from one to ten.
$600This property describes how a mineral reflects light from its surface.
$800This is the most common mineral group found in the Earth's crust.
$1000This specific geometric arrangement of atoms results in a mineral's outward shape.
Hydrology
$200This process involves the conversion of liquid water into water vapor.
$400This term refers to water held underground in the soil or in pores and crevices in rock.
$600This underground layer of water-bearing permeable rock is a major source of water.
$800This process occurs when plants release water vapor into the atmosphere through leaves.
$1000This land area drains all the precipitation falling on it into a common outlet.
Geologic Time
$200This era is widely known as the Age of Reptiles.
$400This principle states that in undisturbed rock layers, the oldest strata are at the bottom.
$600This eon represents the earliest part of Earth's history, spanning from its formation to 4 billion years ago.
$800These preserved remains or traces of ancient life provide evidence of past organisms.
$1000This term refers to a significant break in the geologic record where rock layers are missing.
Oceanography
$200This force, primarily from the moon, is the main driver of oceanic tides.
$400This term describes the concentration of dissolved salts in ocean water.
$600These large-scale systems of rotating ocean currents are driven by wind patterns.
$800This deep, cold, and slow-moving global current is driven by density differences.
$1000This measurement tool is used to map the seafloor using sound pulses.