Answer:
lead pencils (graphite)
fertilizer (potassium, sodium, calcium)
chalk (gypsum)
flashbulb (zirconium)
window glass/mirrors (silica)
table salt (halite)
Explanation:
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Trees, bushes, moss and grass live in a forest habitat.
<span>All natural radiation is at a level low enough to be safe</span>
<span>Carbon is most abundant in the atmosphere and hydrosphere.</span>
