Conclusions Base your answers to questions I to 3 on the diagram below, which illustrates a cross section
of subsurface rocks.
1. Which rock type is the youngest?
(a) A
(b) B
(c) C
(d) D
2. What was the last process to occur?
(a) The igneous intrusion of C
(b) The deposition of layer A
(c) The tilting of rock layers A and D
(d) The deposition of layer B
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Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.

Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.