The earth is like a boiled egg with different layers, namely: the outer core, inner core, crust and mantle. The crust is a thin layer made up of different types of rocks. 2 2.6.1 Identify the layers labelled 1, 2, 3, and 4. (4 x 1) (4) 2.6.2 List THREE main types of rocks that form within layer 1 or below earth surface. (3 x 1) (3 ) 2.6.3 Describe TWO uses of any of the rocks listed in QUESTION 2.6.2. (2 x 2) (4) 2.6.4 Explain TWO important uses of laver 1 to humans. (2 x 2) (4)​