Answer:
a. each particle of matter vibrates about its normal rest position and along the axis of propagation,
b. Liquids
C. because liquids have the right amount of space between them for the wave to pass through quickly
Explanation:
Answer:
Hydrogen could become a future energy source as it can be used to create steam, electricity and other forms of energy. Hydrogen is also considered a clean form of energy, as its only product is water, which is harmless.
Explanation:
<span>Civilizations wanted to settle and build cities and/or outposts along trading routes for so it would be easy to acquire what they didn't have, and sell what they did, and gain economic prosperity. These became the most desirable and wealthy spots, and thus were fought over in wars.</span>
The answer is C because idiopathic means a disease that has an unknown cause.
