oceanograph study guide

sonar

- technology that uses sound waves to map or locate objects on the ocean floor

what is the Okeanos explorer

The Okeanos Explorer is a naval ship used to map and locate new parts of the ocean

71%

Approximately what percentage of earth is covered by water?

96.5%

Approximately what percentage of the Earth's water is contained in the oceans?

how are satalites able to map the sea floor

Earth orbiting satellites are capable of bserving large areas of the ocean at one time. Large undersea objects like SEAMOUNTS(underwater volcanoes) exert extra gravitational pull Deep areas such as the Mariana Trench correspond to lower gravitational attraction.

what is echo in terms of sonar?

Echo is a type of active sona

226,000

How many known species live in the ocean?

what is a multibeam echo and how does it work

Multibeam echo sounder uses sonar to map the ocean floor,but it is able to map more than just the ocean floor beneath.

what is a side sonar scan

Side Scan sonar devices are towed behind ships and can survey areas up to several kilometers wide

the hms challenger

The first serious attempt to learn about the Ocean floor took place during the 3.5 year journey of what ship?

active sonar

Transducers emit an acoustic signal or pulse of sound into the water

mariana trench and philipine trench

What are the names of the deepest parts of the Oceans?

3,970 meters

What is the average depth of the ocean taken as a whole?

36,000 feet

What is the depth of the Mariana Trench?

pacific ocean

What is the largest ocean?

50.1 %

What percent of the global ocean is contained in the Pacific Ocean?

80%

What percentage of earth's oceans have never been explored,mapped,or ever seen?

passive sonars

are used primarily to detect noise from marine objects or marine animals such as whales

what is sounding

lowering weighted lines into the water and noting when the line slackened

the arctic,pacific,atlantic,indian,and southern ocean

name the five oceans

fathom

six feet intervals on the rope used to measure depth

what is seisimic reflection

technology that is used to gather information about the surface structure of the ocean floor

Oceanography

the branch of science that deals with the physical and biological

bathymetry

the science of measuring the depth of water in the ocean, seas, lakes, etc.

Pacific ocean

what is the deepest ocean