All it takes is one look at Grandma Melvyn to understand. This might be a good time to point out that feeling sorry for Grandma Melvyn is like kissing a scorpion. I guess he felt sorry for her because she didn’t have anyone to call her Grandma. Dad started calling her Grandma Melvyn after our real grandma died. She’s my great-great-aunt, but trust me, it doesn’t matter how many “greats” you put in front of her title-there is nothing great about her. Grandma Melvyn is not even my real grandma. But if you have an extra grandma like that, I’m interested. “It’s probably a good idea to warn you about Grandma Melvyn in case you’re expecting her to be a sweet little grandma who brings me cookies and milk and knits me cozy blankies. When you swim at the bottom of the ocean, all the weight of the water between you and the ocean’s surface is pushing down on you. When you float near the top of the ocean, there is only a small amount of water pushing down on you. So there is less pressure! It’s like being in an ocean. (That’s a lot of air!) There is less and less air as you travel from the planet’s surface toward space. Atmospheric pressure is highest at the Earth’s surface because gravity is pulling all the air above it toward the center of the planet.

(That’s why it doesn’t just fly off into space.) Atmospheric pressure is the force of the air pushing against objects. Gravity pulls the atmosphere toward the center of the Earth. We call the air around Earth the atmosphere.

Most of air is nitrogen (78%), oxygen (21%), and other trace gases, including carbon dioxide and helium, which make up less than a tenth of 1%. It is a mix of many other gases, dust particles, and water molecules. OL17334846W Pages 42 Partner Innodata Pdf_module_version 0.0.7 Ppi 360 Rcs_key 24143 Republisher_date 20210222190727 Republisher_operator Republisher_time 166 Scandate 20210218213139 Scanner Scanningcenter cebu Scribe3_search_catalog isbn Scribe3_search_id 9781419708459 Tts_version 4.“Air is the clear gas that surrounds the Earth.

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