a. diamonds
b. rubies
c. emeralds
d. bauxite
The minerals and gems that are commonly mined in the Tropical North are Diamonds, Emeralds, and Bauxite. Thus, the correct options for this question are A, C, and D.
Minerals may be defined as innately possessing inorganic elements or compounds which significantly have an ordered internal structure and attributes of chemical composition along with some physical properties.
Along with minerals and gems like Diamonds, Emeralds, and Bauxite, oil is also found across the region of the tropical north to a larger extent. This region is known as the mineral-rich region where a number of precious minerals, gemstones, oil, etc are found in large quantities.
Therefore, diamonds, Emeralds, and Bauxite are the minerals and gems that are commonly mined in the Tropical North.
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There was no difference between the crystals because Becquerel used pitchblende crystals in both instances.
Becquerel exposed uranium crystals to sunlight and kept pitchblende crystals in the drawer.
There was no difference between the crystals because Becquerel used uranium crystals in both instances.
In past centuries, which continent had most of the world's people?
asia has the most people living there