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Earth History Crossword Puzzle

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Earth History



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8 A method of dating rocks and minerals using radioactive isotopes.
9 A long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. Sedimentary Rock/ Rock that has formed through the deposition and solidifi
11 The formation of new areas of oceanic crust.
15 A system of chronological dating that relates geological strata to time.
18 Hot molten or semi-fluid rock erupted from a volcano or fissure.
19 The two sublayers of the earthís crust (lithosphere) that move, float, and sometimes fracture and whose interaction causes continental drift, earthquakes, volcanoes, mountains, and oceanic trenches.
20 The process of determining an age on a specified chronology in archaeology and geology.
22 A rock that is created from extreme heat and pressure.
24 The process of eroding or being eroded by wind, water, or other natural agents.
25 Hot fluid or semifluid material below or within the earthís crust from which lava and other igneous rock is formed by cooling.
26 The first geological time period of the Paleozoic Era.
31 The remains or impression of a prehistoric organism.
32 The two sub-layers of the earth's crust (lithosphere) that move.
33 The science that deals with the earthís physical structure and substance, itís history, and the processes that act on it.
1 The earliest 4.06 billion years of Earthís history and before the current Phanerozoic Eon.
2 A fossil that is useful for dating and correlating the strata in which it is found.
3 Wear away or change the appearance or texture of by long exposure to the air.
4 An idealized cycle of processes undergone by rocks in the earthís crust, etc. Lithosphere/ The rigid outer part of the earth, considering of the crust and the upper mantle.
5 A 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 earthís crust.
6 Lift up or raise.
7 A basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers.
10 A long and distinct period of history with a particular feature or characteristic.
12 Be broken by a fault or faults.
13 The science of determining the relative order of past events.
14 A period of time in history or a personís life.
16 Very long period of time.
17 A length or portion of time.
21 Matter that settles to the bottom of a liquid.
23 Form into a hard outer layer.
27 A rock formed through the cooling and solidification of magma or lava.
28 Something that is no longer existing.
29 A core sample that is typically removed from an ice sheet
30 The action of deposing someone.
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