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Earth's History Science Puzzle

Across
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
is formed by the deposition of the weathered remains of other rocks
a length or portion of time.
mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
determining the relative order of past events
a hard and rigid shell compared to Earth's mantle.
a division of time that is a subdivision of a period and is itself subdivided into ages
each layer being younger than the one beneath it and older than the one above it.
indefinite and very long period of time
be broken by a fault or faults.
is a core sample that is typically removed from an ice sheet
the process of eroding or being eroded by wind, water, or other natural agents.
the outer layer of the Earth, between the surface and the mantle
the first geological time period of the Paleozoic Era
the science that deals with the earth's physical structure and substance
denoting the earliest eon, preceding the Cambrian period and the Phanerozoic eon.
Down
a method of dating rocks and minerals using radioactive isotopes.
the geological process in which sediments, soil and rocks are added to a landform or land mass.
matter that settles to the bottom of a liquid; dregs.
is a result of a transformation of a pre-existing rock.
hot fluid or semifluid material below or within the earth's crust
distinct period of history with a particular feature or characteristic.
hot molten or semifluid rock erupted from a volcano
the rigid outer part of the earth, consisting of the crust and upper mantle.
is a system of chronological dating that relates geological strata
another word for calendar dating
vertical elevation of the Earth's surface in response to natural causes.
seismically active submarine ridge system situated in the middle of an ocean basin
a fossil that is useful for dating and correlating the strata in which it is found.
slow cooling that occurs there allows large crystals to form.
a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
wear away or change the appearance or texture of (something) by long exposure to the air.