Ore deposits

a. are distributed uniformly throughout the earth's crust

b. are rock units that have a significant concentration of metals

c. are minerals that contain a high amount of lead (pb)

d. have diffuse metal ions bonded to nonmetallic elements in a variety of minerals

its got to be B.

Explanation:

Ores are mainly rocks containing minerals of metals with impurities which doesn't have to be non metals or contains lead (Pb) and also ores are not uniform on the earth crust as we have it different in all parts of the earth

given the reactants, h2so4 and koh, we are asked to determine the product(s) of the reaction. since h2so4 is an acid and koh is a base. this is a neutralization reaction, thus, the products are salt and water. 

so, h+ from h2so4 will react with oh- from koh forming h2o. k+ will also react with so4 2- forming k2so4. therefore, the balanced reaction will be:

h2so4 + 2koh > k2so4 + 2h2o

explanation:

mention the spill to the teacher clean the area and throw the broken pieces away

explanation: