The earth has four main seasons:winter, spring, summer, and fall. which of the following is a cause of seasonal changes on earth?
1.the earth axis is tilted.
2.the earth revolves around the sun.
3.the earth rotates.
pls help me

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?