Quiz Science 425 Word Scramble

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Question	Answer
What is relative dating in geology?	placing of rocks or events in proper sequence
Layers or sediment are generally deposited in a horizontal position is known as the..?	principle of original horizontality
Geologic features that cut across rocks must form after the rocks that they cut through is...?	principle of cross-cutting
What general term denotes any buried, erosional surface where rock layers are missing?	unconformity
What type of fossil is created by mineral-rich water precipitating out into pore spaces	permineralization
A fossil that allows rock’s age to be pinpointed accurately and correlated with other beds..	is an index fossil
What is an isotope?	an atom of a given element with a varying number of neutrons
How is absolute dating measured?	Radiometric Dating
What is the half-life of a radioactive element?	the amount of time for 1/2 of the parent isotopes to decay
When did the Phanerozoic Eon begin?	542 million years ago
The first elements to form after "Big Bang" were ________.	helium and hydrogen
Early Earth was hot because ________.	collisions and radioactive decay produced heat
Which one of the following represents the greatest expanse of geological time?	Precambrian
Earth's primitive atmosphere evolved from gases ________.	expelled from within the earth
The most common Precambrian fossils are ________, layered mounds of calcium carbonate.	stromatolites
The process in which plants use light energy to synthesize food sugars from carbon dioxide is ?	photosynthesis
The beginning of the Phanerozoic is marked by the ________.	development of hard body parts, such as shells and bones
The largest mass extinction in the Phanerozoic occurred in the ________ period.	Permian
The supercontinent of Pangaea began to break up during the ________ era.	Mesozoic
A major obstacle the first land plants had to overcome was ________.	staying upright despite gravity and wind on land
The first fully land-based animals were ________.	reptiles
Mammals became the dominant land animals during the ________ era.	Cenozoic
The oceans cover approximately ________ percent of Earth's surface.	71-74
________ develop where oceanic lithosphere bends downward and sinks into the mantle.	Deep Ocean Trenches
Which one of the following is not part of the continental margin? Shelf, Slope, Rise, or Trench?	Trench
The continental rise is located ________.	between an abyssal plain and continental slope
A passive continental margin will have which of the following features?	Continental Shelf
An active continental margin will have what features?	Continental Slope, Accretionary Wedge, Ocean Trench
Subduction of oceanic lithosphere at the trenches can act like a bulldozer to produce ________.	An Accretionary Wedge
The crests of mid-oceanic ridges contain ________.	Active Rift Zones
The seafloor spreading process at ridges produces what kind of faults?	Normal Faults
Sediments derived primarily from the products of weathering on the continents are called _____.	Terrigenous Sediment
Manganese nodules are an example of ________.	Hydrogenous Sediment

Created by: NMay2