Stack #40838 Word Scramble

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Question	Answer
Which is the best statement of the principle of original horizonality?	sediments are deposited as horizontal layers
An undeformed sedimentary layer is _____ than the layer above and _____ than the layer below.	OLDER then the layer above and YOUNGER than the layer below
The principle of superposition states that	undistrubuted sedimentary layers get progessively younger from bottom to top.
The most common fossils in rocks of the past 500 million years are	Invertebrae Shells
Fossils are most common in which rock types?	Sedimentary
Which is an unconformity?	A gap in the geologic record
Which of the following is the smallest division of geologic time?	Epochs
When did the Mesozoic era begin?	250 million years ago
Radiometric dating is least useful for dating ______________ rocks	Sedimentary
Radiometric dating is possible if a rock contains measurable amounts of	both daughter and parent atoms
Which of the following statements is false?	Weathering and erosion are more important in the oceans than on continents
If you were to start from the east coast of North America and descend into the Atlantic Ocean, you would travel along the	Continental shelf then the continental slope then the continental rise.
In which of the following locations would you most likely find outcrops of basalt on the ocean floor?	on the flank of a rift valley
A traverse from North America across the Atlantic Ocean to Continental Europe would reveal that the ocean floor	is approximately symmetric about the Mid-Atlantic Ridge
Where is the ocean floor deepest?	about 30 km deep
Graded beds of sand, silt, and mud deposited on submarine fans are called	turbidites
Where does most volcanic activity on the seafloor take place?	Mid-ocean ridges
Which of the following is an active continental margin?	the west coast of South America
Which of the following best describes pelagic sediments?	deposited far from continental margins, fine grained, settle slowly on seafloor, ALL OF ABOVE!!
Which of the following currents erodes deposit fine-grained sediments on the continental slope and rise?	turbidity currents
The earths earliest atmosphere most likely did not contain any	unattached oxygen
Life's orgin on earth is believe to have been depend on the prescence of	carbon based chemicals, water, energy, ALL OF THE ABOVE
The first forms on life on Earth	were prokaryotes
The first evidence of fossils that appear to be the remains of living organisms are found in rocks	3.8 billion years old
Unicellular organisms with a membrane bound nucleus that appeared some 2.0 billion years ago are referred to as	Eukaryotes (protistans)
The ___________ refers to the sudden appearance of a large number of complex animals at the beginning of the Paleozoic Era	Cambrian Explosion
Which statement is correct?	Anaerobic respiration preceded aerobic respiration
The Permian extinction	resulted in the extinction of over 90% of marine life and half of the life on land.
According to the 'Snowball Earth' hypothesis	ALL OF THE ABOVE
The K-T extinction	resulted in the extinction of the dinosaurs
What does the elastic rebound theory describe?	the build-up and release of stress during an earthquake
Point A, where slip iniated during the earthquake, is called the	focus
Point B is called the earthquake (at the surface)	epicenter
What is the maximum amount of slip on a fault during an earthquake?	about 10 meters
Which statement regarding aftershocks is true?	The # and size of aftershocks both decrease with time.
Which type of seismic waves arrive at a seismograph first?	P-waves
Which lists the order in which seismic waves arrive at a seismograph station?	p waves> s waves> surface waves
Which seismic waves are the slowest?	surface waves
An earthquake's Richter Magnitude is based on	the amount of ground movement caused by seismic waves
The energy released during a magnitude 8 earthquake is approximately ______ times large than the energy released during a magnitude 6 earthquake	1000 times
What kind of faulting is most likely to cause tsunamis?	thrust mega-thrust
Shallow earthquakes less then 20 km deep, are associated with	convergent, divergent, and transform fault boundries
What type of faulting would be least likely to occur along the mid-atlantic ridge?	reverse faulting
which of the following recent earthquakes killed the most people?	the 2001 Gujarat earthquake, India
Earthquakes that orginate at depths greater then 100 km are associated with _______ plate boundries	convergent
Which of the following statements about tsumanis is false?	tsunamis are producted by tidal forces, which is why they are also called tidal waves
How fast do tsunamis travel across the ocean?	up to 800 km per hour
Which of the following statements is the most accurate?	seismic risks can be reduced, but seismic hazards cannot.
Which of the following regions has the greatest seismic hazards?	western US
Tsuamis can be generated by	undersea landslides, undersea earthquakes, the eruption of an oceanic volcano, ALL OF ABOVE
What volcano represents a major hazard to the cities of Seattle and Tacoma in Washington State?	Mount Rainier
Where do most basaltic magmas originate?	in the earth asthenosphere
Which of the following statements about lava is true?	high temperate lavas are less viscous then low temperature lavas
Which of the following lavas will travel downhill slowest?	rhyolite
Solidified fragments of volcanic material ejected into the air are called	pyroclasts
What type of volcano has the largest and most violent eruptions?	resurgent calderas
Huge mudflows made up of wet volcani debris are called	lahars
Which of the following gases is the main constitent of volcanic gas?	sulfur dioxide
Most of the world's active volcanos are located around the edge of which ocean?	Pacific Ocean
The Cascade Volcanoes are associated with a	convergent plate margin
Over the past 2000 years, which of the following volcanic hazard has caused the most fatalities?	pyroclastic flows

Created by: wabn04