Chapter 20 lesson 3 Eclipses and Tides

what is umbra

• the central darker part of a shadow where light is totally blocked

• the lighter part of a shadow where light is partially blocked

what is penumbra

• the central darker part of a shadow where light is totally blocked

• the lighter part of a shadow where light is partially blocked

if you were standing within an objects umbra how much of its light would you see

• all of it

• half of it

• none of it

• one quarter of it

when the moon's shadow appears on earth's surface is called

• lunar eclipse

• solar eclipse

when is the only time you can see a total solar eclpise

• every day

• anytime

• once a year

• only within the moon's umbra

why don't solar eclipses occur every month

• they do

• they only occur on a new moon when the sun and moon are opposite each other

• they only occur on a first quarter moon

• they only occur on a full moon

this occurs when the moon moves into the earth's shadow

• lunar eclipse

• solar eclipse

the daily rise and fall of sea level is called

• lunar eclipse

• umbra

• a tide

• penumbra

what is the moon's effect on earth's tide

• the difference of the strength of the moon's gravity on opposite sides of Earth cause tides.

• the moon's shadow produces a solar eclipse

when does a spring tide occur

• first quarter moon

• full moon

• third quarter moon

• full and new moon