Describe the biological origin of the following geological deposits: (a) Coal: (b) Oil: (c) Limestone: (d) Peat:

Describe the biological origin of the following geological deposits:

Peat:

Describe five instances in the nitrogen cycle where bacterial action is important. Include the name of each of the processes and the changes to the form of nitrogen involved:

A particle of unit mass moves on a straight line under the action of a force that is a function f(v) of the velocity v of the particle, but the form of this function is not known. A motion is observed, and the distance x covered in time t is found to be related to t by the formula $x=a t+b t^{2}+c t^{3},$ where a, b, and c have numerical values determined by observation of the motion. Find the function f(v) for the range of v covered by this experiment.

(a) Identify the process carried out by diatoms at point.
(b) Identify the process carried out by decomposers at. 6. Predict the consequences to carbon cycling if there were no decomposers present in an ecosystem.

Find each sum. 9 + (−11)

In the diagram above, add arrows and labels to show the following activities:

(a) Dissolving of limestone by acid rain
(c) Mining and burning of coal
(b) Release of carbon from the marine food chain
(d) Burning of plant material.

(a) Calculate the percentage of light energy absorbed that is actually converted (fixed) into producer energy.

Producers $\div$ light absorbed by plants $\times 100=$

(b) State the amount of light energy absorbed that is not fixed.
(c) Account for the difference between the amount of energy absorbed and the amount actually fixed by producers.

Name the four geological reservoirs (sinks), in the diagram above, that can act as a source of carbon:

(a) In what form is carbon found in the atmosphere? _____ (b) In what three important molecules is carbon found in living systems? _____ (c) In what two forms is carbon found in rocks? _____

(a) Name the processes that release carbon into the atmosphere: (b) In what form is the carbon released?

Giving examples, explain how the actions of humans to remove a keystone species might result in ecosystem change.

(a) Name two processes that remove carbon from the atmosphere: ______________.

(b) Name two processes that add carbon to the atmosphere: ________________.

Add arrows and labels to the diagram above to show:

Mining and burning of coal