The property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard is : Hardness and Brittleness
Those properties make chalk leaves residues on the board every time friction happen between the chalk and the board
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Answer:
A stellar-mass black hole forms when a star with more than 20 solar masses exhausts the nuclear fuel in its core and collapses under its own weight. The collapse triggers a supernova explosion that blows off the star's outer layers.
Explanation:
Answer:
Ralph's radial nerve may be getting compressed
Explanation:
Based on the information provided within the question it seems that Ralph's radial nerve may be getting compressed. This nerve, which is located in the armpit region, if compressed can cause temporary cessation of nervous transmission which is what causes numbness (as Ralph is feeling). If this compression continues for too long it can also cause permanent nerve damage.
Answer:
Due to their global position, temperate forests generally receive about 75-150 cm of precipitation every year.
Explanation:
(That's a lot, second only to the Tropics).
