X-rays
a have very long wavelengths
b are blocked by the ionosphere
c are less dangerous than ultraviolet rays
d are not emitted by the sun

h let me think about that

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.