Geology chapter 15

Global circulation of ocean water is influenced by______.

a. surface winds. b. coastal upwelling and downwelling. c. sinking on cold and saline water. >>D. ALL OF THE ABOVE<<

The shallowest portion of the ocean is found along margins of continents in regions termed _______.

continental shelves.

The density of seawater increase with _____.

decreasing temperature and increasing salinity

Because of wave refraction, erosion along an irregular coastline is ____.

greatest in headlands(points of land projected out toward the sea)

the deepest segments of the ocean floor are found _____.

in trenches associated with subduction zones.

Sand groins _____.

increase erosion rates in regions down current from the groin.

The most prominent force inducing tides on Earth is the ______

moon's gravitational pull.

Longshore currents flow____.

parallel to the shoreline.

which type of continental coastline has much broader continental shelf?

passive continental margins

wave crest_____.

refract(bend) so as to impact the shore in a nearly parallel manner.

what percentage of seawater, on average, consist of dissolved salt ions?

3.5%

Approx. what percentage of Earth's surface is covered with water?

70 %.

The form and topography (depth profile) of the ocean floor is termed_____.

Bathymetry

Which of the following is NOT a coastal landform?

Continental shelf.

As waves approach a shore in shallow water, their speed______.

Decreases

Rip currents flow _____.

Directly away from the shoreline.

When the high tide occurs at any single shoreline, that means it is also high tide at all other coast throughout the world. (true or false)

FALSE

Which of the following causes shoreline to move landward?

Sediment is supplied less than eroded.

Compared to continental lithosphere, oceanic lithosphere is ______.

thinner