11.   Ash particles can act as a filter, selectively allowing blue light from the moon to reach the surface of the earth.

12.   Borzelleri said it may be possible for an engineering solution to be found to prevent potentially explosive methane gases and dangerous toxics like hydrogen sulfide from reaching the surface.

13.   By American accounts, the Kursk revved its turbines after the first blast, apparently trying to reach the surface, then plunged to the seabed after the second.

14.   Confidence was growing, although key hardware and procedures needed to reach the surface had yet to be tested.

15.   He recalls reaching the surface of the water and watching the full length of the ship slowly pass him as he yelled for help.

16.   He opened his window and started kicking up, taking two gulps of saltwater before reaching the surface.

17.   If it indeed reached the surface, the water would warm the air above and weaken the high-pressure cell near Easter Island.

18.   If the moss reaches the surface, he prefers a soft plastic floating lizard or frog.

19.   In a volcanic eruption, magma that reaches the surface is called lava.

20.   If your windows do not tilt out, clean them by raising and lowering the sashes so that you can reach the surfaces from the inside.