Life On Planet Earh Flashcards
What is a habitat
The place where an organism lives
What are the three places habitats may be
Terrestrial , land, or aquatic
What is the size of the earth
It is a medium sized planet
The sun is how many I’m away from the earth
150000000km
Earth’s mass does what?
Creates a force of gravity strong enough to to hold gasses near the earth
How far in the atmosphere do gasses extend
Hundreds of km
It is made up of
78% nitrogen, 21% oxygen, and less that 1% argon, water vapours , carbon dioxide and other gases
The atmosphere controls?
Surface temps
Why is the atmosphere critical to life on earth
Answer place it acts like a blanket and control surface temperatures. The insulation prevents excessive heating during the day and cooling during the night.
What does the atmosphere block
It’s blocks solar radiation and which includes ultraviolet lights which is linked to skin cancer.
Lithosphere
The rocky outer shell of the earth that is 50 to 150km thick.
Hydrosphere
All of the water on or above and below the earth surface including oceans, lakes, ice, groundwater, and clouds nearly all the water on earth 97% is in the oceans.
Biosphere
Places where life can exist within the lithosphere , atmosphere, and hydrosphere. All conditions required for life must be met and maintained within this thin layer of ground, water, and lower atmosphere.
Earth has how many species
Over a million
