Is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer.
a. radon
b. carbon monoxide
c. hydrogen
d. nitroge

What causes the cycle of seasons on earth? the tilt of earth’s axis the shape of earth’s orbit the direction of earth’s orbit the distance between earth and the sun

Distance that the transcontinental railroad covered from omaha to san francisco.

This phrase from the declaration of independence and its primary author thomas jefferson can be used to justify which statement? a) jefferson thought this document could be used in his defense were he put on trial for treason. b) jefferson knew that the colonists' actions would have an international impact. c) jefferson believed that a bill of rights was necessary in the new government. d) jefferson was trying to show the king that the colonists were intellectuals.