Answer:
They destroyed Jerusalem. (and conquered it)
 
        
                    
             
        
        
        
Answer;
European isolation from the rest of the world
Explanation;
-The  Age of Exploration was a period from the early 15th century and continuing into the early 17th century, during which European ships were traveled around the world to search for new trading routes and partners to feed burgeoning capitalism in Europe.
-In the process, Europeans encountered peoples and mapped lands previously unknown to them. Among the most famous explorers of the period were Christopher Columbus, Vasco da Gama, Pedro Álvares Cabral, John Cabot, Juan Ponce de León, and Ferdinand Magellan.
-The Age of Exploration was rooted in new technologies and ideas growing out of the Renaissance, these included advances in cartography, navigation, and shipbuilding. 
 
        
                    
             
        
        
        
Because it is important to know the composition of the object
Density is the ratio of the mass of a sample to the volume occupied by that mass, and expresses how much mass there is per unit volume of a given portion of matter. Density is a physical property of extreme importance in the characterization, identification and use of substances or materials.
 
        
             
        
        
        
Answer:
In the UK, high pollution levels are sometimes caused by dust blown from the Sahara desert.
Other sources of air pollution include: sources of smoke, including cigarette smoke, burning fuel in houses for heating or cooking, emissions from power generation, industry and farming.
The UK government has plans to improve pollution due to traffic, and is banning the sale of new fossil fuel cars by 2040, and is phasing out the use of coal in its electrical power generation.