A science procedure has steps chronological order to create or observe a science experiment. Similarly, a recipe has steps in chronological order to create something delicious.
First turn 18% to a decimal, which is .18, then multiply it by 450.
450 x .18 = 81
The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today.
The Rocky Mountains are described as younger because the Rocky's are really two mountain chains. The older mountain chain started billions of years ago, and the younger mountain chain pushed the older mountain chain up more, only 60 millions years ago.