Rearrange the parts to make a meaningful sentence.

P. has alarmed scientists

Q. around the world

R. the ice in the Arctic is melting

S. the speed at which

Explanation

1. 01

   S is the start of the subject, "the speed at which", and "at which" needs a clause: R.

2. 02

   Then the subject's verb: P "has alarmed scientists", and Q says where they are.

3. 03

   So the order is SRPQ: "The speed at which the ice in the Arctic is melting has alarmed scientists around the world."