Meteoroids are small objects in space, usually made of rock or metal. these bodies often get close to a planet and fall through its atmosphere. a burning streak of light, called a , is visible as it falls through the sky. sometimes the object does not burn up completely and a part of it survives the fall to the planet’s surface. these rocky bodies, called , are studied by scientists to gain a better understanding of our solar system. nextreset

First blank = comet

second blank = meteorite

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.