continental margins and ocean basins

Why is mapping our ocean more difficult than mapping the surface of Mars or the Moon?

Water and clouds obscure the seabed.

If a sonar pulse takes 3 seconds to return to the ship after bouncing off the bottom, approximately how deep is the water?

Depth=3×1500​/2=4500/2​=2250 m

Which of these technologies produces the highest resolution bathymetric maps?

Multibeam echosounders.

What does the transition from granite to basalt define?

The true edge of the continents.

The seabed located seaward of the continental margin is called the _______________.

ocean basin.

Continental margins facing the edges of diverging plates are called _________________.

passive margins.

Continental margins near the edges of converging plates are called ______________________.

active margins

Active continental margins tend to be _________________ than passive continental margins.

narrower

These features are formed by turbidity currents: _______________________

Submarine canyons.

The average downward slope of the continental slope is ___________ degrees.

4

What feature is found along the middle of two diverging plates?

An oceanic ridge.