Answer:
The correct definitions are a, c and d
Explanation:
The definitions of system, heat energy and chemical energy are correct but the definition of surrounding is not correct. 
 
        
             
        
        
        
Need for raw materials because of the plentiful amount that is in Africa, such as gold, diamonds, wood, and coal.
        
                    
             
        
        
        
Answer:
B. China has a large population , so its GDP per person is only modest
Explanation:
Despite being one of the countries with highest GDP's in the world, and experiencing enormous economic development in the past few decades, China's population is still not having the same level of financial power as the other countries with high GDP's. The main reason for this is that China has enormous population, being the most populated country in the world with over 1.3 billion people. Because of the enormous population, when the money are redistributed to everyone, it turns out that China is still at a level of a developing country. Not to make mistake, China's population has much higher standard of living than what it had few decades ago, so the people live much better, but the country still has a long way to go to reach the GDP's per capita that the other countries have.
 
        
                    
             
        
        
        
Answer:
Thanksgiving and Martin Luther King Jr. Day
Explanation:
 
        
                    
             
        
        
        
Slowly because air has a hard time to reach the magma because it is below the surface of the erth