I believe it's going to be (2,3)
 
        
             
        
        
        
The water cycle — technically known as the hydrological cycle — is the continuous circulation of water within the Earth's hydrosphere, and is driven by solar radiation. This includes the atmosphere, land, surface water and groundwater.
        
             
        
        
        
Mountain chains and river systems generally run North-South throughout the continent thus making for formidable barriers to East-West expansion.
        
             
        
        
        
They are made up of mainly hydrogen and helium. They are called the gas giants
        
             
        
        
        
conservation, international agreements, managed use,
public awareness