1.)a.)Which of the following statements about reefs is FALSE: reefs are composed
ID: 637414 • Letter: 1
Question
1.)a.)Which of the following statements about reefs is FALSE:
reefs are composed of organisms built of calcium carbonate (CaCO3)
reefs form only in deep water
as islands erode away, reefs may progress from fringing reefs in the beginning, to barrier reefs, to atolls in the end
reefs form at tropical latitudes
b.)Which type of plate tectonic boundary forms the volcanoes that make up the "Ring of Fire":
continental-continental divergent boundary
ocean-ocean divergent boundary
subduction zone
continental-continental convergent boundary
hot spot
c.) Which layer of the earth is thought to be completely molten:
the lower mantle
the inner core
the upper mantle
the outer core
d.) What is the maximum depth (approximately) of an earthquake associated with a transform boundary?
2900 km
30 km
250 km
1 km
670 km
e.) Which of the following is not explained by plate tectonic theory:
the earth’s magnetic field
explosive volcanism at active continental margins
the San Andreas fault
the "fit" of the continents
ocean trenches
Explanation / Answer
Answer( a ) : false- reefs forms only in deep water. [ Explanation- Majorly reefs grow best in warm, shallow, clear, sunny and agitated water. But deep water and cold water reefs also exist.]
Answer( b ) : subductionn zone [ Explanation : Ring of fire formed due to subduction zones of three main active tectonic plates namely the eurasian plate, pacific plate, and indo-australian plate.]
Answer( c ) : lower mantle [ Explnation : The temperature in upper mantle ranges from 900 to 1600 degree fahrenheit and hotter at lower mantle near 7000 degree fahrenheit.]
Answer ( d ) : 30km
Answer ( e ) the fit of the continents. [ Explanation : the fit of continents are described in continental drift theory ]
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.