Answer:
 this is my answer hopes it helps you out
Explanation:
i choose A the atmosphere
 
        
                    
             
        
        
        
Differences between the Troposphere and the Stratosphere:
The troposphere is the lowest level of the atmosphere, so it is in contact with the Earth’s surface. In contrast, the stratosphere is located above the troposphere, so it is not in contact with the Earth’s surface.  Humans live in the troposphere, not the stratosphere. People only spend time in the stratosphere is when they are traveling through it on an airplane, or flying through it while riding in a rocket.  The air density and air pressure are much lower in the stratosphere. In fact, stratospheric air is too thin for people to be able to survive without pressurized air to breathe.
 
        
             
        
        
        
Answer:
Ural Mountains
Explanation:
The Ural Mountains are a mountain range that runs 2500km from Russia to Kazakhstan
 
        
                    
             
        
        
        
Answer: World War II.
Explanation:
By pursuing economic reforms to solve the financial crisis, Roosevelt introduced an economic reform package called the New Deal. These reforms partially addressed the problems of the economic crisis. However, this set of economic reforms has not thoroughly solved the accumulated problems. The crisis ceased at the beginning of the Second World War because, in this way, absolutely every segment of life changed. So the end of the economic crisis began at the beginning of World War II.