Earth is round because: 
1.erosion over time has worn down the jagged edges of its planetesimals. 
2.its interior rock is warm enough to flow slowly in response to gravity. 
solar wind has shaped it. 
3.the gravitational tug of the Moon has worn down the jagged edges. 
4.the gravitational tug of the Sun has worn down the jagged edges. 

Identify the false statement. Stars: 
1.create elements by fusing the nuclei of small atoms into the nuclei of larger atoms. 
2.have limited amounts of fuel and therefore don't exist forever. 
3.all explode cataclysmically when they die and contribute their matter to future star generations. 
4.burn for about 10 billion years. 
5.begin as protostars, which fire up when they collapse and become denser and hotter.