Answer:
Most of the heavy metals on earth came from outer space from supernovas 
This occurs when stars die 
Explanation:
Visit Ted-Ed on You Tube 
Type in the origins of gold and take notes 
Happy to help
 
        
             
        
        
        
Answer: The ice caps are melting 
Explanation: Because of global warming caused by the burning of fossil fuels and other factors the ice caps are melting and so the sea level is rising
 
        
             
        
        
        
American black bear, Cougar, Big Horn Sheep and some others.
 
        
             
        
        
        
<span>In general, as one ascends a mountain, temperature drops by about 10 C for every 1000 meters in altitude gained (a suspiciously round number!). 
I hope I helped!!</span>