Midterm 2021
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What is the correct order of arrival at seismograph station
P-waves, S-waves, surface waves
The richter magnitude of an earthquake is based on
amount of ground movement caused by seismic waves
When seismic waves encounter a boundary between two materials
Some energy is reflected and some refracted at the boundary
The time interval between the arrival of P and S waves at a single seismic station reveals
the distance to the earthquake
The energy released by an earthquake of magnitude 8 is how many times greater than of a magnitude 6 earthquake
900
The epicenter of an earthquake is
The point on the surface above the focus
The largest earthquakes on earth occur at
Subduction zones
A Wadati-Beniof zone is
A zone of dipping earthquakes cause by a subduction zone
From coast to the deepest part of the ocean in what sequence will you cross features
Continental shelf, continental slope, continental rise, abyssal plain
Old, cold and dense oceanic crust
Is destroyed in subduction zones
What is a transition from oceanic crust to continental crust on the same tectonic plate
Passive margin
most recent geomagnetic reversal occurred
800,000 years ago
Large mountain ranges, without volcanoes, form at which type of plate boundary
Convergent: continent-continent
Continent-continent convergence produced
Himalayas
When a deep sea trench is located next to a continent, you expect to find active volcanoes
On the adjacent continent
The current theory of plate tectonics was widely accepted by the year
1970
New evidence that was discovered in the 1960s and was used to support the theory of plate tectonics included
The discovery of magnetic stripes parallel to the mid-ocean ridges
The main source of energy that moves the earths tectonic plates is
heat escaping from the earth as it continues to cool
the stage of a river is measured in
meters
what is the process by which sand grains are moved downstream in a river
saltation
a point bar is found
on the inside of a meander
A one hundred year floor is a flood that
occurs approximately every 100 years
what feature forms where two lateral moraines merge
medial moraine
the ongoing ice age has included approximately how many cycles
20