biogeochemistry

Question 1

Global & local cycles

Answer 1

• global: cycles of elements that occur in gaseous forms (C, O, S, N)
• local: heavier elements (e.g. P, K, Ca) that do not occur as gases (particularly in terrestrial ecosystems)

Question 2

Fossilization & burning of fossil fuels

Answer 2

• fossilization: e.g. formation of peat > coal & oil
• burning fossil fuels: releases organic & inorganic molecules (nitrogen oxides, sulfur dioxide, VOCs, heavy metals)

Question 3

Sedimentary rock formation

Answer 3

deposition/sedimentation of particulate minerals & detritus (typically in aquatic env)

-> occurs over long time

Question 4

weathering

Answer 4

• caused by atm (wind & water) & wildlife
• may be physical (heat, water, ice, pressure) or chemical (biological or atmospheric)

Question 5

erosion

Answer 5

transportation & deposition of weathered material (e.g. by wind & water)