Directions: In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct.

S1. Earth has three layers: the crust, the mantle, and the core.

P.  Earth’s layers constantly interact with each other, and the crust and upper portion of the mantle are part of a single geologic unit called the lithosphere.

Q. The crust is made of solid rocks and minerals.

R. At the centre of the Earth is hot, dense metalcore. 

S. Beneath the crust is the mantle, which is also mostly solid rocks and minerals but punctuated by malleable areas of semi-solid magma.

S6. The lithosphere’s depth varies, and the Mohorovicic discontinuity (the Moho)—the boundary between the mantle and crust—does not exist at a uniform depth.