How Fossils Are Made: This one page handout explains how fossils are made and the kinds of fossils paleontologists study. Fossils Crossword: This crossword on fossils reviews all the terms and content from the 'How Fossils Are Made' handout above.
To decay means to rot, decompose, break down. Our bodiesâanything organicâwill decay after death. Broken sidewalks, potholes, graffiti are all signs of urban decay. Tooth decay is something to avoid. Decay can also mean decline. Anyone, even a great athlete, must exercise regularly to maintain muscle toneâas soon as you stop, the muscles begin to decay. If the strength of the cable signal coming into your house grows weaker over time, you can complain that it has decayed.
Alpha decay or Î±-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and thereby transforms or 'decays' into an atom with a mass number that is reduced by four and an atomic number that is reduced by two.