atmosphere - a blanket of gasses that surrounds a planet, air - the mixture of gases that make up Earth's atmosphere, altitude - a measure of the distance an object is above sea level; usually airborn, atmospheric pressure - a measure of the force per unit area of air molecules in the atmosphere at a given altitude, barometer - an instrument that measures atmospheric pressure, nitrogen - the most abundant gas on earth, body tissue - nitrogen is an ingredient , oxygen - second most abundant gas on earth, humans need this - oxygen, CO2 and Nitrogen - volcanoes release these gases when they rerupt, Earth's gravity - holds gases to the Earth, too small & too close to the sun - two reasons Mercury does not have an atmosphere, gases found on Venus, Earth, and Mars - CO2 and Nitrogen, photosynthesis - process is responsible for the Oxygen in Earth's atmosphere, how carbon is stored on earth - trees die and decompose and create fossil fuels, creates atmospheric pressure - weight of molecules above pressing down, at sea level - where pressure is greatest, high altitudes - where air is least dense, forces inside and outside balance - why are we not crushed by the air pressure around us, how Mercury barometers work - as air pressure goes down, mercury goes up. ,

Gr. 8, Sci - Chapter 5.1 - Atmosphere

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