Petroleum and gas reserves are found in which type of rock layers? basaltic
metamorphic
igneous
O sedimentary

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

i think it is true since you can test the answer and can use observations to complete it.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.