Black in color; contains dense rock with very small, well-formed crystals. What rock is this plzz help me

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

The rules of engagement (roe) working group is often used to (select all that apply.)