Molten material, especially lava is produced in areas
 a. where the crust is especially stable (in cratons)  b. where continents join  c. where plates separate   d. within continents e. in mountain ranges such as the Appalachians

 Divergent boundaries and sea-floor spreading takes place:
 a. within the deep oceanic trenches  b. along the center of the mid-ocean ridges  c. where continents  meet oceans  d. in cratons  e. pretty much everywhere:

The crust of the earth is part of the:
 a. lithosphere  b. asthenosphere  c. mantle  d. low velocity  zone  e. none of these.

Sea-floor spreading (divergence) takes place:
 a. within deep trenches  b. where the lithosphere is heated by convection    c. where continents meet  oceans  d. where-ever there are earthquakes  e. along island arcs.

Continents are not subducted into the mantle because:
 a. they have too low a density  b. they have a high density   c. subduction does not occur near   continents  d. new crust is formed, not destroyed in continents  e. they don't wanna.

In the following list of features or places indicate the type of boundary this feature or place is associated with. Circle:
 A if it is transform,       B for a convergent boundary involving two oceanic plates,
 C for a convergent boundary involving a continental and a continental plate,
 D for a convergent boundary involving an oceanic and a continental plate and
 E if associated with a divergent boundary.

a rift
deep focus earthquakes
a vulcanic island arc w/o an associated trench
a trench next to a continent
an internal mountain range marginal mountain range, volcanos, trench, earthquakes (s,i,d focus)
a major fault, shallow E.Q., no volcanos as in California
a subduction zone, a trench and vulcanic islands arcs such as the Aleutians
the Great African Rift Valley, with its EQ and volcanos
Iceland, with its rift and vulcanic activity
the Phillipine vulcanic island arc and its associated trench
the Mid-Atlantic ridge and rift
the Himalayan, Ural and Appalachian Mountains
where there is no subduction zone, but major metamorphism associated with an internal mountain range and shallow and intermediate focus earthquakes
the Andes mountains along the West Coast of South America with their offshore trench
a major fault that allows plates to slip past each other as in California
where old crust is subducted and there are mountains nearby on land

The crust of the earth is thinnest under:
a. continents  b. oceans  c. mountains  d. plains  e. volcanos.

The mechanism thought by many to be responsible for plate tectonics is:
a. a shrinking earth  b. convection cells  c. magnetism     d. tidal forces  e. vulcanism.

Which of the following represents an example of a collision between two continental plates?
a. the Himalayans  b. the islands of Japan  c. the mid-Atlantic ridge  d. the Andes  e. the San Andreas fault in California.

Today, one of the important sources of heat within the earth is(are):
a. latent heat     b. impact heat  c. radioactivity     d. pressure  e. earth tremors.

Which of the following is not correct about ocean floors?
 a. they are basaltic    b. they are young compared to continents  c. they have paleomagnetic striping
 d. they become younger towards their edges     e. they are made from volcanos

Subduction at the edge of plates is mainly a function of (=due to):
 a. density  b. erosion    c. time     d. uplift     e. randomness (entropy).

The reason plates move at the surface is:
 a. gravity sliding (ridge push)    b. being pulled in subduction zones (slab pull)  c. being pushed by  a shrinking earth   d. continents sliding from the northern to the southern hemisphere      e. answers a and b

The Appalachians, formed by the collision of the US and Africa are_____ mountains:
 a. vulcanic   b. folded   c. faulted   d. erosional   e. none of these

The Appalachians, formed by the collision of the US and Africa are_____ mountains:
 a. marginal    b. folded   c. internal   d. erosional   e. none of these

In general the oldest lithosphere is found:
 a. in continents  b. along coastlines  c. in the deepest part of the ocean  d. along mid-ocean ridges
 e. there is no pattern to rock ages.
 
Which of the following were lines of evidence used by Wegener to support continental drift:
 a. fossil plants   b. fossil animals   c. fit of the continents   d. glaciation   e. they all were

Over time, continents grow by:
 a. accretionary prisms    b. vulcanism   c. deposition along their margins   d. exotic terranes   e. all of these

Although the ocean floors are spreading, the earth is not expanding. The explanation is that:
 a. continents are shrinking   b. plates sink at subduction zones    c. the sea floor migrates over hot  spots    d. volcanos eject materials on top of the earth  e. none of these