Q: Lower rock layers were laid down earlier, so they are assumed to contain older fossils. Gerald laid down many rock layers. The layers on the bottom level were likely laid first or last?
A: first

Q: To reduce friction, oil is added to the engine. If Milo's engine is running hot, how will draining the oil affect friction increase or reduce?
A: increase

Q: Bigger stars produce more energy, so their surfaces are hotter. Jan is comparing stars, specifically a large star and the smaller Sun. Given the size of each, Jan can tell that the Sun puts out heat that is lesser or greater?
A: greater

Q: Objects with greater mass have a stronger force of gravity between them. A planet that is smaller has less gravity or more gravity?
A: less gravity