Dynamic Planet

Seawater is denser than?

Pure water

warm water is less dense than

cold water

what is the density of seawater at 4 degrees Celsius?

1.028g/cm^3

what is a major constituent of seawater?

chloride

what is the average ocean salinity?

35%

surface salinity of seawater is (above or below) average where precipitation is high and many rivers flow into the ocean

below

surface salinity of seawater is going to be (above or below) average in desert areas where evaporation rates are high

above

In polar areas during the winter, the salinity of water under the sea ice_

increases

as pure water cools from 20 degrees C to 4 degrees C, its densitiy

increases

A zone with a rapid change in temperature with depth

thermocline

true or false: water temperature from 300 meters deep to the ocean bottom is relatively uniform

false

When you pour cold water down the side of a glass of warm water, the cold water will

sink below the warm water

When you add salt to water, its boiling point__ and its freezing point__

Increases; decreases

when surface currents converge, the area where the water sinks is called a_

downwelling zone

type of current where waves strike the shore at a slight angle (runs roughly parallel to the shoreline)

Longshore current

what happens if a swimmer gets caught in a rip current?

the swimmer would be carried out to sea, away from the shore

how can a swimmer keep away from gettin ginto a rip current?

swim parallel to the shore or beach

what is a steep

submarine canyon

undersea mountain ranges are than mountains on land

longer

do the northern coasts of north america and siberia have small continental shelves?

no

ocean ridges

mid

what is the deepest part of the ocean called?

Challenger Deep

diurnal tide

semi

When the water level in an area is rising, its called a _

flood

when the water level in an area is falling, its called a _ tide

ebb

what is the approximate tidal range on dec. 3rd between 12pm and 6pm?

around 2.1 feet

what is the tidal period?

12 hours

what is an isolated submarine volcanic mountain with a flat summit called?

guyot

the earth magnetic polarity sometimes

reverses

what occurs near a subduction zones?

earthquakes

the process by which collision of the earth's crustal plates results in one plate's being drawn down or overridden by another, localized along the juncture of two plates

subduction zone

two plates moving away from one another

divergent boundry

two tectonic plates moving towards each other

convergent boundry

two tectonic plates sliding past one another

transform plate boundry

what is produced when a crustal plate moves over a stationary hot spot?

chain of islands

what is less dense than oceanic crust?

continental crust

nitrogen levels are____ in the surface waters of the ocean

low

oxygen levels are ___ in the surface waters of the ocean

high

oxygen concentrations are highest when found in____ _____

high latitudes

the apparent force acting on a body in motion, due to the rotation of the Earth, causing deflection to the right in the Northern Hemisphere and deflection to the left in the southern Hemisphere is called

the coriolis effect

formula for calculating wave speed

C=l/t

tool to measure turbidity

secchi disk

tool used to take deep water samples

nanson bottle

tool to measure salinity

hydrometer/salinometer

tool used to take ocean floor samples

ekman grab