What is planet Earth - Known species of living things At...

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What is planet Earth? The Earth is a planet, which is a globular heavenly body that revolves on a predictable path around a star. It has many diverse parts, consisting of solids, liquids, and gases. There are places on Earth that are inhospitable for life, and other places like the Amazon rain forest where in a single square mile there might be as many as 400 different species of flowers. But how do we explore planet Earth? How do we divide up and define its unique parts? What are the areas of Earth studied by different scientists? ALL NUMBERS APPROXIMATE Third planet from the sun 150 million kilometers from the sun Rotates on its axis once every 24 hours (night/day) Revolves around the sun every 365 days (year) Earth has one moon about 385,000 km away 75% water (ocean) 25% land (continent)
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Unformatted text preview: Known species of living things: At least one million, perhaps as many as 10 million: 950,00 animals 215,000 plants 40,000 molds & mushrooms (fungi) 13,000 chromists (diatoms, kelps) 8,000 protozoa (single-cell, animal-like life) Earth's Equatorial Circumference is 40,000 km Earth's Equatorial Diameter is 13,000 km One degree of latitude or longitude = 111 km A minute (1/60th of a degree) = a little less than 2 km Highest mountain top is 9000 m Lowest point on the continents 420 m below sea level Ocean’s deepest point 11000 m Temperature range is about 60°C to -90°C Atmosphere: 77% nitrogen 21% oxygen The rest is argon, CO2 & water vapor Earth solid parts (i.e., crust, mantle, & core) 35% Iron 30% Oxygen 15% Silicon 10% Magnesium The rest is Nickel, Sulfur &Titanium...
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