and answers already passed
Earth Science - correct answer ✔The name for all the sciences that
collectively seek to understand Earth. It includes geology, oceanography,
meteorology, and astronomy.
Geology - correct answer ✔The science that examines Earth, its form and
composition, and the changes it has undergone and is
undergoing.
Oceanography - correct answer ✔The scientific study of the oceans and
oceanic phenomena.
Meteorology - correct answer ✔The scientific study of the atmosphere and
atmospheric phenomena; the study of weather and climate.
Astronomy - correct answer ✔The scientific study of the universe; it includes
the observation and interpretation of celestial bodies and phenomena.
Geologic Time - correct answer ✔The span of time since the formation of
Earth, about 4.6 billion years.
Hypothesis - correct answer ✔A tentative explanation that is tested to
determine whether it is valid.
Theory - correct answer ✔A well-tested and widely accepted view that
explains
certain observable facts.
,Nebula Theory - correct answer ✔The basic idea that the Sun and planets
formed from the same cloud of gas and dust in interstellar space.
Hydrosphere - correct answer ✔The water portion of our planet; one of the
traditional subdivisions of Earth's physical environment.
Atmosphere - correct answer ✔The gaseous portion of a planet; the planet's
envelope of air. One of the traditional subdivisions of Earth's physical
environment.
Biosphere - correct answer ✔The totality of life on Earth; the parts of the
solid Earth, hydrosphere, and atmosphere in which living organisms can be
found.
Geosphere - correct answer ✔The solid Earth, the largest of Earth's four
major spheres.
Crust - correct answer ✔The very thin outermost layer of Earth.
Mantle - correct answer ✔The 2900-kilometer- (1800-mile-) thick layer of
Earth located below the crust.
Lithosphere - correct answer ✔The rigid outer layer of Earth, including the
crust and upper mantle.
Asthenosphere - correct answer ✔A subdivision of the mantle situated below
the lithosphere. This zone of weak material exists below a depth of about 100
kilometers (60 miles) and in some regions extends as deep as 700 kilometers
, (430 miles). The rock within this zone is easily deformed. Also known as the
low-velocity zone.
Lower Mantle - correct answer ✔The part of the mantle that extends from the
core-mantle boundary to a depth of 660 kilometers (400 miles).
Core - correct answer ✔The innermost layer of Earth, located beneath the
mantle. The core is divided into an outer core and an inner core.
Outer Core - correct answer ✔A layer beneath the mantle about 2200
kilometers
(1364 miles) thick that has the properties of a liquid.
Inner Core - correct answer ✔The solid innermost layer of Earth, about 1300
kilometers (800 miles) in radius.
Plate Tectonics - correct answer ✔The theory which proposes that Earth's
outer shell consists of individual plates that interact in various ways and
thereby produce earthquakes, volcanoes, mountains, and the crust itself.
Lithospheric Plate - correct answer ✔A coherent unit of Earth's rigid outer
layer that includes the crust and upper unit. Also known simply as a plate.
Continent - correct answer ✔Large, continuous areas of land that include the
adjacent continental shelf and islands that are structurally connected to the
mainland.
Ocean Basin - correct answer ✔A deep submarine region that lies beyond
the continental margins.