Ared supergiant star is ten times more massive than the sun. what would be the likely impact on the motion of earth if the sun were replaced by this red supergiant? a year on earth would be shorter because earth's orbital speed would increase. a year on earth would be shorter because earth's orbital speed would decrease. a day would be longer because the gravity experienced by earth would be stronger. a day would be longer because the gravity experienced by earth would be weaker.

Ageologist is working in an area with exposed sedimentary rocks and finds a well exposed sequence of stratified rocks. as he works through a thick sequence of limestone, he sees abundant large clam fossils that produce an interlocking texture suggesting a reef, but within the limestone section these clams disappear and the overlying limestone is made up primarily of fragments of corals. he now moves 50 km away and finds limestones interbedded with shales, and the limestones contain the same clam fossils he had seen previously 50 km away. as he continues through this section, the rocks become entirely limestone, and the clams disappear again with coral fossils above forming a reef structure. he concludes