What causes tides
Tides are caused by the interaction of the Earth, the moon and sun. Also gravity.
Describe what happens to temperature & pressure as you descend through a water column
Temperature decreases, pressure increases
Tsunamis are most common in the _____ Ocean
How do dunes reduce beach erosion
Dunes are covered with plants. They make beaches more stable and protect the shore from erosion. The plants roots hold sand in place and slow wind and water erosion
Describe the part of the ocean that would have the lowest salinity
At the mouths of large rives such as the Amazon or Mississippi. Also, near the surface rain, snow, melting ice add fresh water to the ocean
What is the average salinity of ocean water
1 kilogram of ocean water contains 35 grams of salt, or 35 parts per thousand
What is the most abundant salt in sea water
Why is studying the ocean floor difficult
Darkness, cold and extreme pressure due to being so deep
About how often do tides occur
High and low tides--12 hours and 25 minutes; Neap tide-first and third quarter; Spring tide--2 month new and full moon
What is the main cause of surface waves
Waves form when WINDS blowing across the water's surface transmit energy into water
Why do currents curve to the right in the Northern Hemisphere
Describe what happens to water in a tide pool as it begins to evaporate
Water is warmed and remaining water is saltier
In what type of water do coral reefs usually form
Shallow tropical waters
What is the only part of the open ocean that receives enough sunlight to support the growth of algae
Who owns the majority of the ocean
Most of the world's major ocean fishing areas are located in the ______ zone
What conditions do the animals in the intertidal zone have to be able to endure
Pounding of waves and changes in salinity and temperature. Also withstand periods of bing underwater and being exposed to air
________are the organisms that form the base of open-ocean food webs
What is spring tide? What causes it?
Spring tide--a tide with the greatest difference between high and low tide that occurs when sun and moon are alinged with Earth. Causes by gravitational pull
What is neap tide? What causes it?
Tide with the least difference between low and high tide. Occurs when sun and moon are at 90 degree angle. Sun's gravity pulls some to the water away from the tidal bulge facing the moon
What is upwelling and why is it important?
upwelling is the upward movemnet of cold water from the ocean depths. Brings up tiny ocean organisms, minerals, and nutrients from deeper layers. Without upwelling, surface water of open ocean would be very scarce in nutrients
Why are mangrove trees important to their coastal habitats?
Mangrove trees break the action of winds and waves. The prop roots trap sediment from land. They create a protected nursery rich in nutrients for young animals.
Explain conditions in the surface zone
Surface zone-only part of the ocean that gets enough sunlight to grow algae. Goes down to about 200 meters. Temperature ______________________ Salinity _____________. Density__________________________. Organisms_________
Explain the conditions in the deep ocean
So deep you can't see. Cold, dark, wet, few organisms. Salinity_________________ Density___________________ Pressure_________________