Answer: Well i mean if were talking about beach sand than no it did not disappear when the ocean waves crash the shore the waves bring the sand back with them since the ocean has salt in it it kind of dissolves the sand into a mushy kind of thing which is what you feel when you go into the water.
Answer: I'm really lost to. I think its asking you to describe and explain what fossil fuels do
Explanation:
When the atmosphere is filled with high concentrated particles? Sorry if this is wrong
Answer:
cut-off grade of the copper deposit. = 4.6 kg/ton 0r .46 % cu by weight
Explanation:
Given data:
percentage of deposite copper is 0.80%
selling price of cu is $1.73/kg
overall unit cost = $6.5/ton
overall recovery 82%
= 11.3 $/ton
unit profit = (gross value - unit costs)
= (11.3 - 6.5)
=4.84 $/ton
cut off grade of copper deposit
= 4.6 kg/ton 0r .46 % cu by weight