Earth's minerals have been found in concentrated amounts at the boundaries of tectonic plates: an occurrence that results from the activities at these boundaries. Which statement best explains how minerals become concentrated at these boundaries?

A. Mantle upwelling and downwelling bring various minerals to Earth's surface and, at the same time, take minerals back into Earth's
interior.
B
Minerals from Earth's interior make their way from Earth's core through the layers via convection to Earth's surface and become
concentrated there.
C. Water in Earth's oceans sinks into the crust, becomes hot, and dissolves minerals, these minerals precipitate out as water cools
upon escaping Earth's interior at plate boundaries,
D
Hot water from Earth's interior gushes out; dissolved minerals precipitate out of the water as it cools, and this helps to concentrate
Earth's minerals in various locations over Earth's surface.

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride