Gustaf observes a chemical reaction between two substances in a glass beaker. while observing the reaction, he touches the beaker and notices that it feels warm. why does the beaker feel warm?

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

What do lava flows made of aa indicate about the type of volcanic eruption that occurred? a. the eruption was viscous. b. the eruption was pyroclastic. c. the eruption was explosive. d. the eruption was quite. !

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above