Asubstance that speeds up a chemical reaction without being changed itself is known as?

That huge volcanoes  can  be found here? from the air,  you  see that it covers a huge area, about 14 million square kilometers   antarctica  is just slightly larger than  another  continent in the southern it is  located  on the coast and is 4,876 meters (16,000 feet) tall. under the surface of  antarctica, all is  notcold and quiet.

If 1/5 of the students are in the football team and the class has 40 students, you need to multiple this numbers to know the exact number of students that form the team.40 x 1/5 = 8 studentsif 4 more students join: 8+4= 12 studentsto know the %: 40 students are equivalent to the whole class (100%). then 12 students are how much %? 40 students  = 100%12 students  =    x  %x= 30% of students are in the team.