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Learning Set 4 (Part Two)

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Across
1
Cells responsible for vision in dim light
3
Circular opening in center of eye that controls amount of light that enters the eye
6
Change in direction of a wave when it enters a new medium with a different wave speed
7
Opening between middle and inner ear
8
First bone in middle ear
10
Nerve that carry signals from eye to brain
12
Layer at back of eye with cells that respond to light and color
14
Connects inner ear with brain and carries impulses
16
Radiant energy that can travel through a vacuum or matter in the form of waves
19
Layer of tissue that acts as a covering, connection, or lining
20
Flat, colored, ring-shaped membrane in eye
23
Instrument used to detect and record seismic waves
26
Caused by an earthquake or vibrations inside Earth
Down
2
Ability of a wave to spread out or change direction as it passes through an opening or around an obstruction
4
Structure that changes shape to focus light and images on retina
5
Continuous range of wavelengths that includes all types of electromagnetic waves
9
Turn back from a hard surface
11
When medium and energy in a wave is turned back from a hard surface
13
Tiny particle or packet of light energy
15
Membrane that separates outer ear from middle ear
17
Region in a longitudinal wave where particles of the medium have highest density
18
Second bone in middle ear
21
Third small bone in middle ear
22
Distance a wave travels in a given period of time
24
Bounce off or deflect in different directions
25
Time required to complete one cycle of a wave