Systems and Cycles Final UPDATED Exam Questions and CORRECT Answers
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Course
Systems and Cycles
Institution
Systems And Cycles
Systems and Cycles Final UPDATED
Exam Questions and CORRECT Answers
What is the primary source of heat within Earth's modern day interior? - Correct Answerradioactive decay
Like every other terrestrial planet in our star system, Earth's core is composed primarily of
which chemical element? -...
Systems and Cycles Final UPDATED
Exam Questions and CORRECT Answers
What is the primary source of heat within Earth's modern day interior? - Correct Answer-
radioactive decay
Like every other terrestrial planet in our star system, Earth's core is composed primarily of
which chemical element? - Correct Answer- iron (Fe)
Which layer of Earth's geology behaves like a brittle solid, unlike other layers that behave
more like a plastic or ductile solid? - Correct Answer- lithosphere
Which of the following is NOT a line of evidence that provides us with data about Earth's
core? - Correct Answer- direct core samples
Which description best applies to the material found inside Earth's mantle? - Correct Answer-
hot, dense silicate rock rich in Mg and Fe
What ingredient appears necessary to lower the melting point of hot upper-mantle or crustal
rock, so that partial melting can occur and plate tectonics becomes possible? - Correct
Answer- H2O
The presence of (129)Xe and (26)Mg in meteorites directly implicates what type of event as a
contributor to the formation of our solar system? - Correct Answer- supernova
What is the approximate age of the Earth and our solar system? - Correct Answer- 4.6 billion
years
Expanding clouds from supernova detonations are rich sources of what material? - Correct
Answer- heavy elements
Stars like the Sun are powered by fusion reactions that consume hydrogen and create which
element? - Correct Answer- helium
, As the Sun ages over billions of years, it gradually changes in what way? - Correct Answer-
the Sun is slowly expanding and brightening
Which is NOT a line of evidence supporting an impact-capture model for the Moon's
formation? - Correct Answer- the Moon carries ample water beneath its surface in vast
underground aquifers
Comets contain organic material but are primarily composed of what type of substance? -
Correct Answer- ices and rock
Among the types of planets that can exist, which type is (maybe) NOT present in our solar
system? - Correct Answer- super-Earths
The Late Heavy Bombardment most likely occurred after which planet out to a further orbit?
- Correct Answer- Neptune
Approximately how many exoplanets are currently known to exist? - Correct Answer- 5,000
Which of the following is NOT an organic compound? - Correct Answer- CO2
Organic compounds can form in space, for example in star-forming nebulae, through the
interaction of dust and gas with... - Correct Answer- UV radiation
In the 1950s, the famous Miller-Urey experiment first demonstrated what fact about the
origins of life on our planet? - Correct Answer- organic molecules are easily and
automatically produced by simple natural processes
Nucleotides, which make up molecules such as ATP, RNA and DNA, are comprised of what
three basic parts? - Correct Answer- phosphate, a 5-carbon sugar, and an amino acid
The most likely geochemical environment where life began on Earth was where? - Correct
Answer- seafloor hydrothermal vents
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