Flashcards in Sea Level, Tides, & Waves Deck (44)
changes in sea level is changes to sea ______
what two main processes affect sea level/sea volume?
1. how much water is stored in glaciers and ice sheets
2. fact that water molecules expand in warmer temps and contract in cooler
Expansion/contraction of ocean water in response to ________ changes
______ temperatures means more meltwater from ______.
If there is more meltwater from glaciers, then...
the sea level will raise
If you have colder global climates, sea level will...
why will sea level drop with colder global climates?
because there will be more water frozen into glaciers and ice sheets
water molecules expand in _____ temperatures, and contract in _____ temperatures
current sea levels _____ at an average of ____ mm per year
which areas are more at risk for sea level rises?
low-level flat coastal areas
what are some effects of sea-level rising?
- more erosion during serve storms
- pushed back beaches
- land subsidence.
-causes decreases in fish and shelfish population
what is land subsidence?
AS soil becomes saturated, the land will sink, and houses will sink along with it or down into it
what are tides?
the rise and fall of sea levels that occur on a daily level
Every _____ hours we see two high tides
Every 24 hours we see ____ high ties
Every ____ hours we see two low tides
every 24 hours we see how many low and high tide?
2 of each 2 high, 2 low
What are tides caused by?
the gravitational attraction of the moon and the sun
AS the Earth rotates on its _____ the moon and the sun are constantly _____ on the waters of the Earth
The Earth is constantly is rotating through...
the gravitational attraction
As tides moves in and out of coasts they set up tidal _____
As the tide falls and lowers ____ water flows out towards the sea.
when the tide falls and lowers more water flows out towards the sea. This is called which current?
rising tide creates the _____ current
tidal currents act to remove...
sand piled up by shore processes
Tidal currents _____ and ______ sediment that is rich in organic material, such as dead fish carcasses and seaweed
a wave is _____ in the ocean
what is a wave caused by?
the energy of the wind
shallower water _____ the wave towards its ____