30 Jun Oceans & Global Environment Module 18 Human Impacts Reflective Questions
Question Description
Quiz Instructions
Your essay answer should be clear and succinct, amounting to perhaps 3-5 sentences totaling 50 to 80 words; longer essays are strongly discouraged. It is recommended that you prepare your answer in a separate document from which you copy it into Canvas.
Question 1 5 pts
Describe the processes that determine the fate of petroleum leaked or spilled into the ocean and how the characteristics of the petroleum spillage affects its persistence in the environment.
A strong answer will describe the processes that degrade, disperse, or deposit petroleum, citing specific examples, explain the controls on these processes in terms of environmental factors (e.g water temperature) and properties of the petroleum (e.g. volatility, solubility), and refer to the end products from such events.
Question 2 1 pts
Which of the following explanations best explains why plastic debris in the North Pacific accumulates in the region known as the Great Pacific Garbage Patch?
Materials dumped or lost in the North Pacific are transported by currents and focused in this ocean gyre by geostrophic flow
The area of the Great Pacific Garbage Patch represents the site where most plastic debris is dumped
Plastic material from Asia only travels westward halfway across the North Pacific
Plastic material from North America only travels eastward halfway across the North Pacific
The idea of the Great Pacific Garbage Patch derives from the number of islands in this region of the North Pacific that accumulate plastic debris
Question 3 2 pts
Which two of the following phytoplankton are species of dinoflagellates that can produce red tides?
Karenia brevis
Tetraselmis
Ulva prolifera
Akashiwo sanguine
Aphanizomenon
Question 4 2 pts
Which two of the following types of ocean pollutant – here associated with their origins from anthropogenic sources – have no natural source?
Synthetic chemicals contained in pesticides
Hydrocarbons spilled during transport of petroleum
Heavy metals present in industrial effluents
Nutrients from agricultural fertilizers
Plastics manufactured as petroleum products
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