Braided Rivers/Gyres
This type of wide, shallow river flows in many interwoven channels across a flat area. What is this?
A braided river
What landform, like the Mississippi or Ganges, is often heavily populated by people?
Delta
What do you call the place where river water mixes with ocean water?
An estuary
What large pieces of Earth's crust move and affect the size of the oceans?
Tectonic plates
What is the weather phenomenon called when ocean water near South America becomes cooler than normal?
What are the sand and gravel island between the channels of a braided river called?
Braid bar
Why is farming successful in deltas?
Because the soil is very fertile
What type of water mixes together in an estuary?
Fresh water and salt water
What happens to an ocean basin when tectonic plates move apart?
It becomes wider/ The ocean gets larger
Where does the surface water cool during La Nina?
What is the Pacific Ocean near South America
Why does a braided river form when a river flows over flat land?
Because it drops heavy sediment
Give one reason deltas are good places for people to live besides farming.
It has plenty of fresh water, flat land for building, or good transport and fishing.
What causes water in an estuary to move back and forth during the day?
Tides
What is the process called when one tectonic plates sinks beneath another?
A subduction
What causes colder water from deep in the ocean to rise during La Nina?
Winds pushing warm water away
In the Northern Hemisphere, which direction do gyres spin?
Clockwise direction
This combination of natural features makes deltas good locations for cities and trade. What are the features?
Flat, low lying land and access to rivers and sea.
Rivers flow one direction while estuaries flow back and forth
How do tectonic plates destroy ocean crust and shrink ocean basins?
By moving toward each other and causing subduction
How often does La Nina usually occur?
Every three to five years
What effect caused by Earth's rotation makes moving water curve instead of travelling straight?
The Coriolis effect
Explain why deltas often become heavily populated using at least two reasons.
Deltas have fertile soil for farming and easy access to fresh water, transportation, trade or fishing.
What two forces shape estuaries, unlike river channels which are shaped mostly by one?
River flow and ocean tides
Over long periods of time, how does tectonic plate movement change the size of oceans?
It causes oceans to grow or shrink over millions of years
Why is La Nina considered an important weather phenomenon?
Because it changes weather patterns around the world