A science teacher sets up a demonstration for her class. She turns on three electric hot plates. On each hot plate is a beaker of water. Between the hot plate and the beaker is a block of material: metal, granite, or glass. The blocks are all the same size. The water in the beaker
above the metal block boils first.
Why does the water in the beaker on the metal block boil first?
O A Metal lets out more heat than the other substances,
O B. Metal is a harder material than the other substances,
O c. Metal transfers heat faster than the other substances,
OD. Metal is better at reflecting heat than the other substances,

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Answerapply an acl that has all deny ace statement;

Ithink it’s b hope it

Stars are born within the clouds of dust and scattered throughout most galaxies. a familiar example of such as a dust cloud is the orion nebula. turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. as the cloud collapses, the material at the center begins to heat up. known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the milky way are paired or in groups of multiple stars.therefor, i would say the answer is: dust and gases contract.i hope this ! < 3