2 1.1.4 Quiz: Matter Formation Question 5 of 10
What two things balance to maintain the shape of a star?
A. Orbiting and gravity
B. Pressure and velocity
C. Pressure and gravity

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.