Which of these is a pure substance?

a. cake mix
b. ocean water
c. 10 carat gold
d. solid gold

Avoltage source vs = 10 v is in series with a resistor of 10 kohm. if the source transformation theorem is applied, what will the value of the current source be in ma ?

How can one distinguish breccia from conglomerate? a. breccia contains angular clasts and conglomerate contains rounded clasts. b. breccia contains rounded clasts and conglomerate contains angular clasts. c. different minerals cement breccia than cement conglomerate. d. breccia contains sand and conglomerate contains silt.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c