What is the difference between major constituents, minor constituents, and trace elements? What are
some examples of each? What will be an ideal response?
ANS:Answer
should include:
? The ocean contains all the elements that are found in the Earth's crust. These elements
are in different concentrations in the ocean.
? Major constituents are the most abundant elements in the ocean. These are the majority
of dissolved inorganic solids which make up the salinity of the ocean. The most
abundant ions in the ocean include chlorine, sodium, sulfate, magnesium, calcium,
potassium and bicarbonate.
? Minor constituents are those that have a higher concentration than 1 part per million, but
are not considered abundant. Examples of minor constituents are: bromine, strontium,
boron, silicon, and fluorine.
? Trace elements are those that are in less than 1 part per million concentrations in the
ocean. There are 14 important trace elements that are essential for the processes of life.
These trace elements include nitrogen, lithium, iodine, phosphorus, zinc, iron,
aluminum, manganese, lead, mercury and gold.
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The global trend in sulfur emissions can be characterized by
A) increasing rates of emission in almost every country. B) decreasing rates of emission in almost every country. C) decreasing rates of emission in the industrialized countries but increasing rates in the developing countries. D) increasing rates of emission in the industrialized countries but decreasing rates in the developing countries.
In 2009, the G-20 nations agreed to ________
A) increase subsidies to fossil fuel industries by 10-12% B) double the subsidies to fossil fuel companies C) set a goal to produce 60% of their energy from clean, renewable sources by 2030 D) postpone developing renewable energy resources until 2050 E) gradually phase out their fossil fuel subsidies
Choose appropriate way(s) that volcanoes might impact people living nearby:
A. Ash ejected into the atmosphere blocks sunlight. B. Volcanic ash provides fertile sediment for growing crops. C. Projectiles thrown into the air can hit your house. D. Releases steam and noxious gases into the atmosphere. E. All of these impact people living nearby.
"Partly cloudy skies" is an example of a qualitative forecast
Indicate whether the statement is true or false