<span>The information in the sentence below tells us that the census takes place every "ten years," since in this case the word "decennial" means ten years. </span>
It was discovered in <span>Nevada</span>
1- turkey
2- Saudi Arabia
3- Sri lanka
4-Russia
5-java
6- Tibet
7- Japan
8- Himalayas
hope this helps
not sure about 1 and 4
