estuaries

Which of these are features of an estuary?

• steep sides

• low lying valley

• mudflats

• deep base

• deeper river channel

Which course would you find an estuary?

• upper course

• middle course

• lower course

Which is the main process in the formation of an estuary?

• transportation

• erosion

• deposition

• none of the above

Where does the large river enter the sea?

• source

• meander

• mouth

• lower course

Why does the river channel become wider and deeper?

• the ice age means that the sea level rises and flood the low lying valley

• the ice age causes the sea level to fall as more of the water is stored as ice

• The high rainfall in summer means that there is more water in the river system

• The water from the river combines with water from the sea, which mean that the river is wider and deeper

What are the types of water that can be found in the estuary?

• salt water

• fresh water

• brack water

• none of the above

Why would the mixing of salt water and fresh water cause deposition of sand and silt in the river channel?

• The two types of water are different temperatures so some of the water sinks causing deposition

• The two types of water are different densities so the water will speed up causing deposition

• The two types of water are ravelling at different speeds to one will deposit while the other erodes

• The two types of water are different densities, so there will be less energy and more deposition when the two mix

What is created when the sand and silt is deposited, and when is the only time they can be seen?

• beaches low tide

• mudflats low tide

• beaches high tide

• mudflats high tide

What is the difference between the high and low tide called?

• tidal range

• tidal difference

• tidal bore

• all of the above in different countries