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Direct Hit

Theme A - Unity & diversity

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Page Facing Up

Theme B - Form & Function

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Pill

Theme C - Interaction &  Interdependence

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Keycap Digit One

Theme D - Continuity & Change

<ul>
	<li>Sun&#39;s Birthday: About 4,500 million years ago, two-thirds of the Universe&#39;s age.</li>
	<li>Earth&#39;s Baby Steps: Gravity mushed gas and dust together to create Earth.</li>
	<li>Life? Nope!: Initially, no life. Just gases, but not like today.</li>
</ul>

<ul>
	<li>Oxygen: Only a little! It preferred hanging out with iron to make iron oxide. Think of rust; it&#39;s everywhere!</li>
	<li>Methane &amp; Carbon Dioxide: More of these party animals back then. Why? Volcanoes and meteorites! Imagine a hot and gassy birthday party.</li>
	<li>Temperature: Probably warmer, even though the Sun was 20% shy with its energy. It was like having a giant natural heater!</li>
</ul>

pH Mystery: The oceans were like mood rings, ranging from pH 5 to pH 11. Talk about mood swings!

<ul>
	<li>Ozone: Nope, wasn&#39;t around! So, more solar UV rays partied on Earth&#39;s surface.</li>
	<li>UV Rays: High-energy party crashers causing chemical reactions.</li>
	<li>Lightning? More!: Possibly more lightning, triggering unexpected chemical reactions.</li>
</ul>

<ul>
	<li>Special Places: Hot springs, hydrothermal vents, and even the atmosphere cooking carbon compounds. Imagine Earth as a giant experimental kitchen!</li>
	<li>Carbon Compound Soup: Rains washing down carbon compounds into pools and lakes. A real-life primordial soup! 🍜</li>
</ul>

The Big Question: Which carbon compounds formed? Uncertain, but think of life&#39;s Lego blocks like acids, aldehydes, amino acids, and DNA/RNA bases.

<ul>
	<li>Oxygen Revolution: Life started, and BOOM! Oxygen went from zero to 20%. Talk about an overachiever!</li>
	<li>Greenhouse Effect: Reduced. Thanks to the ozone layer, we got UV protection.</li>
	<li>Ironic Twist: Life evolving made it impossible for life to evolve again. Talk about a plot twist!</li>
</ul>

Titan&#39;s Breathing Space: Similar to Earth, but with an orange smog due to ethane, propane, propene, and hydrocarbons. Imagine Earth&#39;s rebellious sibling.

<ul>
	<li>The Miller-Urey Experiment: Scientists in the &#39;50s recreated early Earth&#39;s conditions in a lab. They produced amino acids, the building blocks of proteins! It was like cooking up prehistoric recipes.</li>
</ul>

Understanding early Earth helps us appreciate the complexity and beauty of life. It&#39;s like piecing together a puzzle that&#39;s 4.5 billion years old. The clues are scattered, but the story is fascinating. Isn&#39;t biology the best mystery novel ever? 🕵️&zwj;♂️🧪🧬

Theme A - Unity & diversity

Explore Earth & Titan's Ancient Secrets!

Table of content

Formation of Earth & the pre-biotic period

Ancient air - what was breathing like?

Mysterious oceans

Sunbathing on early Earth

Unlock the Full Content!

Theme A - Unity & diversity

Explore Earth & Titan's Ancient Secrets!

Table of content

Formation of Earth & the pre-biotic period

Ancient air - what was breathing like?

Mysterious oceans

Sunbathing on early Earth

Unlock the Full Content!