A wave front has the form of a surface of a sphere
She does work from the moment she touches the book until she lets it go. Work is anything that requires energy. Therefore, she is working as she picks up the book, carries it, and when she is lifting it onto the shelf.
Volcanoes<span> are formed when magma from within the Earth's upper mantle works its way to the surface.</span>
Answer:
Earth is 81 times as massive as the moon. In other words, you'd need to crush 81 moons together to equal the mass of our planet. Being much less massive, its attractive power is far less. On the moon you can jump 9 feet (2.7 meters) in the air from a standing position compared to just 1.5 feet (0.5 m) on Earth. Near Jupiter, the most massive planet, you'd only achieve 6 inches, while on Martian moon Phobos, a jump would launch you straight out into space.
Explanation:
<h2>#hope</h2>