Why is this the answer?

The answer is hay because this clever riddle describes the amazing life of dried grass and all the helpful things it does. Let's look at all the clues one by one to see how they point right to hay! The first clue says, "You can tumble in it, roll in it." On a farm, hay is often gathered into big, fluffy piles or rolled into huge round or square bales. It is very light and bouncy, which is why it feels fun to roll or tumble on, like a giant, soft mat. The bales are just as much fun to climb! The next two clues are "burn it" and "animal eat it." Hay is really just dried grass, so it is extremely dry and can be burned to make fire for warmth or cooking. This is why farmers are very careful about where they store it. Most importantly, hay is a super healthy meal for many farm animals, including horses, cows, and sheep, especially when there is no fresh grass for them to eat in the cold winter months. It keeps them strong and well fed. The riddle also gives clues about where we find hay, saying it is "Used to cover floors, still used beyond stall doors." In a barn, hay is often spread out on the ground inside the stalls to make a soft, warm bed for the animals to sleep on. This keeps them clean and cozy. Finally, the riddle tells us that it "Freshens whatever it is placed on. Absorbs whatever is poured into it." Freshly dried hay smells wonderful, like a warm, sunny field of grass, which can help a barn smell much nicer. And because it is so fluffy and dry, it is naturally very absorbent and can soak up water or other liquids very well, which makes it perfect for animal bedding. All of these special jobs make hay the perfect solution to this tricky word puzzle!