You didnt exactly put in any answer options...
But here is my answer: Comparing a desert to Mars, i would say that 
A desert has oxygen 
And mars has carbon dioxide
A desert has sand 
Mars has a rocky surface
Mars is a planet
A desert is not
The things i could think of that a desert and planet mars can relate to...I would say they both have heat and both sometimes have dust storms.
 
        
             
        
        
        
Its electrons relese and it dies. or another way to say it is that it burns. 
        
                    
             
        
        
        
Answer:
21 m
Explanation:
La energía potencial de un cuerpo es la energía que posee el cuerpo en virtud de su posición.
La energía potencial se da como;
E = mgh
Dónde;
m = masa del cuerpo
g = aceleración por gravedad
h = altura del cuerpo
Aquí necesitamos obtener la altura del cuerpo.
h = E / mg
h = 10500/50 * 10
h = 21 m
 
        
             
        
        
        
Answer:
(Show a picture/reference of the question)
Easy Explanation:
Condensation - Water vapor turning into liquid.
Evaporation - Liquid to water vapor.
Freezing - Water turning into ice.
Melting - Ice turning into water.
 
        
             
        
        
        
The answer to this question is 
burning trees