Discussion
The average rock density of continental crust and the oceanic crust respectively are :
Answer: C
The average densities are 2·7 gm/cm\(^{3}\) and 3 gm/cm\(^{3}\).
Continental crust is broadly granitic, rich in quartz and feldspar, with an average density of about 2.7 g/cm\(^{3}\). Oceanic crust is basaltic and gabbroic, richer in iron and magnesium, at about 3.0 g/cm\(^{3}\). This contrast is why continents stand high and oceanic crust sinks back into the mantle at subduction zones.
Option A reverses the two and inflates the first. 8 and 12 gm/cm\(^{3}\) are values for the core, not the crust. Option D gives gm/m\(^{3}\), a unit a million times too small.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development