Billy and juan were out hiking. they crossed the train tracks and all of a sudden juan shouted: "i think i hear a train! " "i can tell you for sure if a train is coming," said billy. what did billy do? a) he put his ear to the train track. b) he cupped his ear with his hand. c) he closed his eyes and listened. d) he stuck his head underwater.

What happens whenever a net force acts on an object

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes