71 As a balloon is filled with Carbon Dioxide, the buoyant force of the air outside the balloon
Increases
72 Roentgen rays are
Sun rays
73 Light is
A form of energy
74 An object that reflect light of all wavelengths appears
White
75 An object that absorb light if all wavelengths appears
Black
76 Comparing to air, sound waves in water travels
Much faster
77 What is an echo?
A sound repeated by reflection
78 The scientist that did some experiments with gravity first of all was
Galileo
79 Scientifically speaking, all motions are
Relative
80 A Mercury is a
Metal but is present in liquid form at room temperature
