Praxis 5005 science
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what is the earths only natural satelite?
the moon
what are earth’s months based on?
moons rotation around the earth
what do fossils give us?
a record of how life on earth has changed over time
what don’t fossils give us complete evolution?
because not all organisms get preserved and not all fossils are found
How were the Hawaiian Islands formed?
stationary hot spots that came from the outer core
how did one hot spot in hawaii form all the islands?
the pacific tectonic plate moved over the course of thousands of years therefore creating multiple islands
what are gametes?
sperm and egg cells
what are zygotes?
fertilized eggs
What are haploid cells?
when you have 23 chromosomes (n)
what are diploid cells?
when you have 46 chromosomes (2n)
What are earth’s compositional layers?
Crust/Lithosphere, mantle, core
crust (compositional layer)
Outermost solid layer and made
What material is in the Mantle (compositional layer)?
not liquid, composed of aluminum, silicates, & plastic
Lithosphere (mechanical layer)
outer most, rigid, earth’s crust
What material is in the Asthenosphere (mechanical layer)?
not a liquid, soft plastic
What material is in the Mesosphere (mechanical layer)?
material flows but at a slower rate, stiff plastic
What material is in the outer core (mechanical layer)?
layer of liquid iron and nickel, only layer of earth that is a true liquid
What does the Hydrosphere contain? (Earth’s Spheres)
all water on earth in liquid form (lakes, rivers, oceans)
What does the biosphere contain? (earth’s sphere)
all ecosystems and living organisms
What does the cryosphere contain? (earth’s sphere)
masses of frozen water (frozen lakes, rivers, oceans, glaciers)
What are Earth’s Spheres?
lithosphere, hydrosphere, biosphere, cryosphere, atmosphere
What is in the atmosphere (earth’s sphere)?
gasses that surround the planet
What gasses surround the planet?
nitrogen: 78%, oxygen: 21%, argon: 0.09%, helium: small traces, neon: small traces
What are the compositional layers?
crust, mantle, core
