Which of the following is not true of minerals? They are(have):
a. crystalline.
b. organic.
c. naturally occurring.
d. definite chemical composition.
e. characteristic physical properties.
B
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Where did Saturn's rings likely come from?
A. volcanic activity on its surface ejecting matter into space B. either a moon that never formed, or a moon destroyed by tidal forces C. the decay of radioactive particles in the outer fringes of Saturn's upper atmosphere D. the gravitational capture of old satellites and other space junk lost from Earth's orbit and other space missions
The moon and Earth remain in a stable orbit due to their mutual gravitational attraction being offset by inertia
a. True b. False
The major causes of desertification are overgrazing and trampling of soil by livestock. Indicate whether the statement is true or false
Lightning is
A) when warm and cold air collide. B) an indication of a high salt content in the air. C) an indication that the atmosphere is virtually dust free. D) a discharge of static electricity.