Regents Review #2 Dynamic Crust due 4/27 3:15p.m.

Earth's internal heat is the primary source of energy that

• warms the lower troposphere
• melts glacial ice at lower altitudes
• moves the lithospheric plates
• pollutes deep groundwater with radioactivity

A P-wave arrives at a seismic station 11 minutes and 40 seconds after the earthquake. How long after the first P-wave arrives will the first S-wave arrive? 

• 5  minutes
• 8 minutes 40 seconds
• 9 minutes 40 seconds
• 21 minutes 20 seconds

The Aleutian Islands extend westward from southern Alaska to form the northern boundary of the Pacific Ocean. These volcanic islands were formed by the nearby

• subduction of a continental plate
• subduction of an oceanic plate
• divergence of a continental plate
• divergence of an oceanic plate

What is the primary geologic process occurring along the San Andreas fault?

• transform movement
• spreading movement
• subduction
• convergence

Compared to the oceanic crust, the continental crust is usually

• thicker, with a less dense granitic composition 
• thicker, with a more dense basaltic composition 
• thinner, with a less dense granitic composition
• thinner, with a more dense basaltic composition

Which mantle hot spot is located directly below a mid-ocean ridge plate boundary?

• Yellowstone
• Iceland
• Canary Islands
• Hawaii

What is the approximate P-wave travel time from an earthquake if the P-wave arrives at the seismic station 8 minutes before the S-wave?

• 4 minutes 20 seconds
• 6 minutes 30 seconds
• 10 minutes
• 11 minutes 20 seconds

Compared to the surrounding material, mantle plumes rise toward Earth's surface from the core-mantle boundary because they are 

• cooler and less dense
• cooler and more dense
• hotter and less dense
• hotter and more dense

A seismic station recorded the P-waves , but no S-waves, from an earthquake because S-waves were

• absorbed by Earth's outer core
• transmitted only through liquids
• weak and detected only at nearby locations
• not produced by this earthquake

According to p. 10 of the Reference Tables, the MOHO is between the

• outer core and inner core
• asthenosphere and stiffer mantle
• crust and rigid mantle
• stiffer mantle and outer core