Any of two or more forms of the same element which differ only in the number of neutrons their atoms contain is called an
a. irregularity
b. isomer
c. isotope
d. irritability

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.