It's A. I don't know why, but I got it right, so
 
        
                    
             
        
        
        
A geographic coordinate system<span> or a GCS uses a three-dimensional spherical surface to define certain locations on earth. Also, a GCS is often mistakenly called a datum, but a datum is just one part of a GCS. 
Finally, a GCS includes a prime meridian, </span><span>an angular unit of measure, </span>and a datum :)
        
             
        
        
        
Increase
Explanation:
The discharge of a river traveling through a temperate region will typically increase downstream. For arid regions, the discharge decreases downstream. 
- Discharge is the volume of water of a river that flows through a point per seconds. 
 - In a temperate region, as a river flows downstream, more bodies of water from different sources joins together with it. 
 - Rivers generally tend to flow into natural basins which are located downstream. 
 - These basins are located at very low elevation. 
 - As more bodies of water collects together, the volume of the water will increase and so is the discharge too. 
 
Learn more: 
Downstream brainly.com/question/2286502
#learnwithBrainly
 
        
             
        
        
        
Instead, they packed the earth, which is rich in clay, into thick walls that provided insulation from the hot summers and cold winters.
Explanation:
hope that helped :)
 
        
                    
             
        
        
        
The answer is B. Tsunamis. The underwater and above water volcanoes around the Ring of Fire erupt due to the high amount of tectonic activity, which causes the tsunamis.