Chemical weathering is noted by which of the following?
a. does not change the appearence
b. changes the appears
c. changes the chemical makeup of the rock
d. turns the rock into a carbon based compound

Out of the choices given, chemical weathering is noted by the changes the chemical makeup of the rock. The correct answer is C. 

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11