What occurs along a convergent plate boundary?
a. earthquakes and hot spots
b. volcanoes and ridges
c. hot spots and ridges
d. earthquakes and volcanoes

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Most of the volume of an atom is occupied by the