science book #3 and #4 Flashcards
What do the words emit and reflect mean?
emit-creating light
reflect-light bounces off
what objects in space emit light?
sun and stars
what objects in space reflect light?
moon, comets, planets, meteors
What are three reasons why the planet Earth is the only planet that is able to support life?
- liquid water
- breathable atmosphere
- right distance from the sun (temperature)
What are the layers of the atmosphere?
Troposphere Stratosphere Thermosphere Ionosphere Exosphere
One fact about the Troposphere
weather is formed here
One fact about the Stratosphere
the layer where the jet stream is and the ozone layer
One fact about the Mesosphere
the coldest layer and it protects us from meteors
One fact about the Thermosphere
hottest layer, widest layer, least air molecules
One fact about the Ionosphere
electrically charged ions, northern lights are here
One fact about the Exosphere
satellites orbit here
why is it harmful to look at the sun with your naked eye?
uv rays can cause permanent eye damage
what are two safe methods for viewing the sun?
welders mask and solar eclipse glasses
what positions do the Earth, the moon and the sun have to be in for a partial or total solar eclipse to occur? draw a diagram
E m S
why does the sun appear to move across the sky each day?
Earths rotation
