PHYS203 Exam 3-Questions 2025/2026 with 100%
Correct Solutions
oceanography
the study of the earths hydrosphere
most of the world is made up of?
ocean
what ocean takes up practically a hemisphere?
the pacific ocean
oceanology
the more correct word for the study of the earth's hydrosphere
bathymetry
the measurement of depths in the ocean below sea level
hypsometry
the measurement of elevation above sea level
sounding
a technique used by sailors for thousands of years to measure depth below sea level, lower a
heavy object until it hits bottom and then measure the rope or chain
fathoms
units used to measure depth of ocean
,what is a fathom in feet and yards?
6 feet or 2 yd of ocean depth
echo sounding
emit a sound into the ocean and it goes to the bottom of the ocean and bounces off which is
called an echo and a microphone picks up the echo
what is the average speed of sound in the ocean?
roughly 1 mile per second
If a ship emits a sound into the ocean and it takes 6s to detect the echo, how deep is the
ocean?
3 miles
how does the time(s) relate to depth(mi) in echo sounding?
the depth is half the time * 1 mi
SONAR (Sound Navigation and Ranging)
a more accurate form a echo sounding, you emit many sounds and detect many echos
where is maximum elevation above sea level?
mt Everest
where is the maximum depth below sea level?
The Challenger Deep in the Mariana Trench in the pacific ocean
what is the average depth below sea level?
,3.7 km
what is the maximum depth below sea level?
11km
what is the maximum elevation of the continents above sea level?
less than 9 km
what is the average elevation of the continents above sea level?
less than 1km (840 meters)
does the bottom of the ocean count as the surface of the earth?
yes
how do you drill rock at the bottom of the ocean?
you have to assemble and disassemble the drill on site
what was the first ship to drill rock at the bottom of the ocean?
the deep sea drilling project 1968
what replaced the deep sea drilling project?
ocean drilling program 1983 and they were able to drill 2 km past the bottom of the ocean
what replaced the ocean drilling program?
the integrated ocean drilling program 2003 which is able to drill 7km past the bottom of the
ocean.
topography
, the arrangement of the natural and artificial physical features of an area.
ocean basin (abyssal plain)
the bottom of the ocean
the largest flattest parts of the surface of the earth are?
ocean basins
continental margin
the edge of a continent where it meets the ocean
active continental margin
where there is active geological activity
passive continental margin
where there is no active geological activity
what are 2 examples of a passive continental margin?
east coast of north america and east coast of south america
oceanic ridge
where two tectonic plates are diverging and molten rock has come up
what do we find at an active continental margin?
continental trench
what are 2 examples of an active continental margin?
Correct Solutions
oceanography
the study of the earths hydrosphere
most of the world is made up of?
ocean
what ocean takes up practically a hemisphere?
the pacific ocean
oceanology
the more correct word for the study of the earth's hydrosphere
bathymetry
the measurement of depths in the ocean below sea level
hypsometry
the measurement of elevation above sea level
sounding
a technique used by sailors for thousands of years to measure depth below sea level, lower a
heavy object until it hits bottom and then measure the rope or chain
fathoms
units used to measure depth of ocean
,what is a fathom in feet and yards?
6 feet or 2 yd of ocean depth
echo sounding
emit a sound into the ocean and it goes to the bottom of the ocean and bounces off which is
called an echo and a microphone picks up the echo
what is the average speed of sound in the ocean?
roughly 1 mile per second
If a ship emits a sound into the ocean and it takes 6s to detect the echo, how deep is the
ocean?
3 miles
how does the time(s) relate to depth(mi) in echo sounding?
the depth is half the time * 1 mi
SONAR (Sound Navigation and Ranging)
a more accurate form a echo sounding, you emit many sounds and detect many echos
where is maximum elevation above sea level?
mt Everest
where is the maximum depth below sea level?
The Challenger Deep in the Mariana Trench in the pacific ocean
what is the average depth below sea level?
,3.7 km
what is the maximum depth below sea level?
11km
what is the maximum elevation of the continents above sea level?
less than 9 km
what is the average elevation of the continents above sea level?
less than 1km (840 meters)
does the bottom of the ocean count as the surface of the earth?
yes
how do you drill rock at the bottom of the ocean?
you have to assemble and disassemble the drill on site
what was the first ship to drill rock at the bottom of the ocean?
the deep sea drilling project 1968
what replaced the deep sea drilling project?
ocean drilling program 1983 and they were able to drill 2 km past the bottom of the ocean
what replaced the ocean drilling program?
the integrated ocean drilling program 2003 which is able to drill 7km past the bottom of the
ocean.
topography
, the arrangement of the natural and artificial physical features of an area.
ocean basin (abyssal plain)
the bottom of the ocean
the largest flattest parts of the surface of the earth are?
ocean basins
continental margin
the edge of a continent where it meets the ocean
active continental margin
where there is active geological activity
passive continental margin
where there is no active geological activity
what are 2 examples of a passive continental margin?
east coast of north america and east coast of south america
oceanic ridge
where two tectonic plates are diverging and molten rock has come up
what do we find at an active continental margin?
continental trench
what are 2 examples of an active continental margin?
