Gravity is the force of motion pulling down objects to the ground. If there was no gravity, everyone would walking as if they were on the moon. 
Mass is what gravity needs. If an object has a little amount of mass, gravity will be able to easily bring it to the ground. 
If an object has a very huge amount of mass, gravity will still be able to bring it to the ground but it will be hard. 
For example: An airplane has a HUGE amount of mass. Gravity pulls it down but the airplane needs to be steering up in order for it to be straight. Gravity is applied on the airplane when it is landing. 
BUT..... if a table is in the way of an object it depends if it will fall down to the ground or stay on the table. 
If an object has little mass and a table is in the way of gravity pulling it down to the ground, the object will stay on the table. Like a plate of food on a table. 
If an object has a very big amount of mass and a table is in the way of gravity pulling it to the ground, the object will break the object and make it's make to the ground. That is mostly why most of the time people have very strong tables/ anything to hold a heavy object.  
Another example is if you're lifting weights and you have little amount of mass, you're most likely to get the little sized weight. It depend on you mass. 
Here are some pictures I included here as well of Mass and gravity. 
Glad to help! :) :D 
 
        
        
        
It would be the water based carbon cycle
        
             
        
        
        
Answer: Evaporation of salt water 
Explanation: During the process of evaporating salt water which involves simple distillation, pure water is separated with salt molecules.
When heated water evaporates from the solution since it is less dense. When condensed it becomes pure water and salt is left out since it is more denser.
 
        
             
        
        
        
there are 1000 meters in one km
 
        
                    
             
        
        
        
Answer:
Negative 
Explanation:
Any atom gaining electrons will get a negative change since the charge of the electron is negative.