The altitude is usually low. Tropical places are mainly on the ocean, that's usually why it's so hot. They are usually close to the equator, but not right on it. The tropics get a lot of direct sunlight, so wear that sunscreen! The ocean currents are warm, so they bring along warm water. All of those help make the tropics the way they are.
Hope this helps
Answers are:
1. Exothermic
2. Endothermic
3. Pendulum
4. Bob
5. Period
6. Conservation of energy
7. Potential energy
8. Kinetic energy
9. Chemical energy
10. Nuclear energy
That Organ is be percussion.
In optics, a diffraction grating is an optical component with a periodic structure, which splits and diffracts light into several beams travelling in different directions.