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Earth is the third planet from the Sun and the only astronomical object known to harbor life. [23] This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust.
Earth Day falls on April 22 each and every year, and while some may consider it to be something of a non-holiday, celebrated solely in grade school, it really is a day to celebrate the planet that ...
The date was chosen to appeal to college students. In part, April 22 was chosen as the date for Earth Day because it fell squarely between spring break and final exams — an important distinction ...
Here are 10 interesting facts about Earth Day. ... The date for Earth Day was largely dictated by the schedules of the college students Hayes and Nelson were hoping to attract. April 22 fell on a ...
the Earth's mass, its gravitational field, and its angular inertia. These are all affected by the density and dimensions of the inner layers. [20] the natural oscillation frequencies and modes of the whole Earth oscillations, when large earthquakes make the planet "ring" like a bell. These oscillations also depend strongly on the inner layers ...
Earth is the only planet in the galaxy known to support life. Earth has many places that are suitable for humans to live in, although some areas of the planet can be very dangerous, too. About 71% of Earth's surface is covered in salt water oceans. Earth is the only place in the Solar System where liquid water is known to exist at present.
Around 1 billion people take part in Earth Day activities around the world every year. 8. In the lead-up to Earth Day in 2024, millions of people worldwide will participate in Earth Hour on March ...
The earliest Earth crust probably forms similarly out of similar material. On Earth the pluvial period starts, in which the Earth's crust cools enough to let oceans form. c. 4,404 Ma – First known mineral, found at Jack Hills in Western Australia. Detrital zircons show presence of a solid crust and liquid water.