Answer:
Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).
Explanation:
Answer:
The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. 400 B.C. Democritus, a philosopher in ancient Greece, began the search for a description of matter.
Explanation:
2Na + Cl2 ------>2 Na⁺Cl⁻
Na⁺Cl⁻ - sodium chloride
D: <span>Coronal Mass Ejections
e: Solar wind
f: </span><span>solar wind and magnetic field and Auroras
C1: single
C2: binary
C3: masses
C4: clusters
D1: </span><span>spectrum and color
D2: temperature
a: red
b: blue-white
3: </span><span>H-R diagram
4: main
a: </span><span>top and giants
b: </span>bottom and dwarfs