Coastal ecosystems (Sand Dunes and Salt Marshes)

Question 1

sand dunes

Answer 1

• found all over world
• accumulation of sand shaped into mounds and ridges by wind

Question 2

sand dunes develop best when

Answer 2

• wide beach
• large quantity of sand
• [revailing wind onshore
• tidal range allow sand to dry
• suitable locations for sand to accumulaye

Question 3

stages of sand dune

Answer 3

1. embryo
2. fore
3. yellow
4. grey
5. dune slack
6. mature

Question 4

formation of sand dune

Answer 4

• wind blows sand
• sand deposited – obstruction
• more sand – dunes grow
• forms rows at 90* to prevailing
• colonized and fixed w vegetation

Question 5

salt marshes

Answer 5

• all over world
• not temperature dependant
• ecosystem intertidal zone
• flat w numerous channels
• build up over sea level
• communitues of salt plants
• devbelopment of vegetation
• good coastal defence
• threatened by human activity