OCNG
Which of the following is a characteristic of oceanic-oceanic convergent plate boundaries?
Volcanic arc
Volcanic features on the ocean floor that are less than 1,000 meters (0.6 miles) tall are called
abyssal hills
Extending from the base of the continental rises into the deep-ocean basins are flat depositional surfaces called
abyssal plains
solar nebular hypothesis suggests
all bodie in the solar system formed from an enormous gas cloud
What technology solved the problem of locating longitude at sea?
an accurate sea watch
Older lithosphere is destroyed in association with
deep ocean trenches
The Mid-Atlantic Ridge is an example of a
divergent plate boundary
All of the following are considered part of the continental margin except the:
fracture zone
Lithosphere
is composed of the crust and the uppermost portion of the mantle
Which of the following is a source of dissolved salts in seawater?
minerals dissolved from weathering of the crust
At divergent plate boundaries, plates are
moving away from each (trench.)
Active continental margins have
plate boundary at edge of continent, narrow and steep shelf. rocky coast line, and ends in a trench
Large volcanoes on the seafloor that are cone-shaped on top because they never reached sea level are called
seamounts
The correct order of seafloor features from the coast to the mid-ocean ridge is:
shelf, slope, rise, abyssal plain
Deep ocean trenches are associated with
subduction zones
Evidence for continental drift incudes:
the fit of the continents, matching sequence of rocks and mountain chains, past glacial activity, the distribution of organisms
Relatively few abyssal plains are located in the Pacific Ocean due to:
the presence of convergent active margins
passive continental margins have
wide, shallow shelves , continental rise, no plate boundary at edge of continent, and flat sandy coast
The depth of the continental shelves is usually between
0-200 meters
The abyssal plains have an average depth of about
4,500 meters
Approximately what percent of the Earth's surface is covered by ocean?
72%
Passive and Active margins both have
Continental shelf is the first part of the seafloor Is the submerged edge of the continent Submarine canyons form in the continental slope
crust
The lowest density compositional layer of the earth is the
The European "Age of Discovery" ended with:
Ferdinand Magellan's circumnavigation of the globe
ocean ridges
New lithosphere is produced in association with
Characteristics of active continental margins include all of the following except:
broad continental shelves
Submarine canyons were most likely formed by:
erosion by turbidity currents