The two substances are rock (molten and solid) and metal (solid + liquid).
Layers of the earth from the outside in:
1. crust. hard rock/dirt/ground. Shell
2. mantle. melted rock and stuff. Egg white
3. core. Outer core - liquid. Inner core- solid. Nickle and iron. Yolk
It is best defined as a "proposed explanation".
Answer:
Yes. Indeed they are...(?)
Answer:
I'm pretty sure it's transport blood cells
Answer: Moving from red light to violet light, the energy increases. From equation 1 and 2, we say that energy is directly proportional to frequency and inversely proportional to wavelength.