Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of
A) the Sun.
B) the openings themselves.
C) both of these
D) neither of these
Answer: A
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The formation of our _______________ occurred about 4.6 billion years ago
Fill in the blank(s) with correct word
A stream's load is divided into three components: dissolved load, ______________ load, and bed load
Fill in the blank(s) with correct word
A 40.0-kg box is being pushed along a horizontal, smooth surface. The pushing force is 15.0 N directed at an angle of 15.0° below the horizontal. What is the acceleration of the crate?
A) 0.158 m/s2 B) 0.362 m/s2 C) 0.466 m/s2 D) 0.375 m/s2 E) 0.684 m/s2
The _____ of a star is the time it takes the star to complete a cycle from bright to faint to bright again
A) life span B) luminosity period C) period of pulsation D) half-life