There could have been a water source there a long time ago. The temperatures get higher as the years progress.
        
             
        
        
        
Answer:
C
Damage to the environment occurs because:  In the process of obtaining goods and services we enjoy, pollution occurs
 
        
             
        
        
        
Answer:
Frequency invoice
Explanation:
When several times the voice repeating occurs in a limited period. It is in the form of waves. It is also called a voice band means that the frequencies occur within the part of audio that is used for the transition of speech of a person or animal. It is a fundamental frequency in human voice especially in males ranges from 80 to 180 Hz and in the female, it ranges from 165 to 255. The fundamental frequency falls below the voice frequency. In this process the sound works as an acoustic sound source:
  
 
        
             
        
        
        
Answer: conflicts between China and Western countries
Explanation:
 
        
             
        
        
        
<span>Can vary among individuals or groups within a single society, is what we holds as symbols that the meanings is attached. The people or humans have an unlimited capacity to create and manipulate symbols, they are also makes so many ideas to create symbols and it is continuous over time.</span>