Answer: Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.
Answer: reconstruction of the south
Explanation:
Answer: Leonhard Euler
Explanation: Although Albert Einstein perfected pie, It is widely acknowledged that Leonhard Euler makes it first.
Answer: Hunter-gatherer culture was the way of life for early humans until around 11 to 12,000 years ago. The lifestyle of hunter-gatherers was based on hunting animals and foraging for food.
Explanation:
If there had been no Ancient Greek civilization we'd be behind in literature, art, technology, science and much more. The Greek gave the world new ideas and an individual right in self government. The world right now would probably be in the 1619 A.D not 2019 A.D.
