Why is Earth geologically active?
*Rocky crust, mantle, metal core, rigid lithosphere.
Gravity pulls high density material to the center
What processes shape Earth's surface?
Impacting craters, volcanism, tectonics, and erosion.
How does Earth's atmosphere affect the planet?
all x-ray light is absorbed very high in the atmosphere
ultraviolet light is absorbed by ozone
certain moluces let sunlight through but trap escaping infrared
any gas that absorbs infrared
mocules with 2 different types of elements
makes sky blue
atmosphere scatters blue light from the sun making it appear to come different directions
sunsets are red because less of red light from the sun.
Was there ever geological activity on the Moon or Mercury?
moon Some volcanic activity 3billion years ago must have flooded lunar craters.
Mercury long cliffs indicate that Mercury shrank in nearly history.
What geological features tell us that water once flowed on Mars?
conditions of craters indicates surface history
Volcanoes as recent as 180 million yrs ago
moat water is frozen underground
Why did Mars change?
mores has not had widespread surface water for 3 billion years
Is Venus geologically active?
cratering on Venus
fractured and contorted surface indicates stress
Why is Venus so hot?
greenhouse effect keeps surfaces 470°C
Venus has very thick carbon dioxide atmosphere
carbon dioxide atmosphere produces an extremely strong greenhouse effect
earth escapes fate because there is water and rocks
reflective clouds keep sulfuric acid
upper atmosphere has fast winds with no explanation
Runaway greenhouse effect
would account Why Venus has little water
What unique features of Earth are important for life?
surface liquid water
How is human activity changing our planet?
human made cfc in the atmosphere destroyed ozone
human activity is driving other species to extinction
humans use fossil fuels produces greenhouse gases