Rock Layers

I think that 4 was the first one because 4 is the bottom one out of every other one 

5 was the next one because it couldn't be 2 or B because 2 came on top of 5 and b split up 5 

2 came before 6 and 1 because 6 is over 2 and 3 was the most recent because it goes over all the rocks

6000 year old earth

After watching this slideshow I thought that the scientist figured that the earth was older than 6000 years old because of the high mountains. They mountains usually take about a million years to be that tall and counting how many tall mountains there are they must have took about billions of years to grow