This topic contains a solution. Click here to go to the answer

Author Question: What is a continental margin? What are the differences between active and passive margins? Include ... (Read 87 times)

Frost2351

  • Hero Member
  • *****
  • Posts: 557

What is a continental margin? What are the differences between active and passive margins? Include
  alternative names for the margins and the plate boundaries associated with each. What will be an ideal response?



Question 2

How did the study of bathymetry progress with new technologies? Include important developments
  and events in history that impacted bathymetry. What will be an ideal response?




Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Galvarado142

  • Sr. Member
  • ****
  • Posts: 348
Answer to Question 1

ANS:Answer
should include:
 Continental margins are the outer edges of the continents. These are heavily influenced
by plate tectonics.
 There are three divisions of continental margins. The continental shelf is the shallow,
relatively flat section that is close to shore. The continental slope is the more steep
section of the margin that goes seaward. The last division is the continental rise which
blends the continental margin into the deep-ocean basins.
 Active margins are associated with converging plate boundaries. There is high
earthquake and volcanic activity at these margins. This type of margin generally has a
narrow shelf with varying topography. These are often called Pacific-type margins due
to their common occurrence in the Pacific.
 Passive margins occur at diverging plate boundaries. There is a broad shelf with a gentle
slope. They are also called Atlantic-type margins. There is very little earthquake and
volcanic activity at these locations.



Answer to Question 2

ANS:Answer
should include:
 In 85 BCE, Posidonius began to study bathymetry in the Mediterranean Sea. He used
two kilometers of rope with a stone at the end of it. The rope was hand lowered over the
side of the ship until it hit the bottom.
 The HMS Challenger used a similar method of lowering a rope, but then used a steam
powered winch to move the line.
 The sinking of the Titanic in 1912 led to the invention of the Iceberg Detector and Echo
Depth Sounder. This device was adapted for Naval use by the United States in 1922. It
was then used on the German research vessel Meteor a few years later.
 Single beam echo sounders improved and multiple beams were attached to the hulls of
ships resulting in a multibeam echo sounder. The multibeam sounder produced more
detailed images because it generated additional beams of sound.
 Satellites have increased the amount of information available about the seafloors.
Satellites are efficient and accurate. They measure the surface height of the ocean which
varies with different bathymetric features





Frost2351

  • Member
  • Posts: 557
Reply 2 on: Aug 22, 2018
Gracias!


olderstudent

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Excellent

 

Did you know?

Medication errors are more common among seriously ill patients than with those with minor conditions.

Did you know?

The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

For a complete list of videos, visit our video library