Biology SL
Biology SL
4
Chapters
553
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Theme A - Unity & Diversity
Theme A - Unity & Diversity
Theme B - Form & Function
Theme B - Form & Function
Theme C - Interaction &  Interdependence
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Theme D - Continuity & Change
IB Resources
Theme A - Unity & Diversity
Biology SL
Biology SL

Theme A - Unity & Diversity

Unlocking Earth’s Water An Extraplanetary Mystery

Word Count Emoji
541 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 14th Jun 2024

Table of content

How did Earth get all this water? 🚀

Earth's got a lot of water! About 1.4 billion cubic kilometers of it, and 98.3% is liquid. So where did it all come from? Imagine a pot of water boiling away - that's what Earth's surface would have been like when it formed. So, the water had to come later. But how? Let's explore!

The asteroid water delivery service 💥

One theory is that Earth ordered water from an "asteroid delivery service"! Sounds crazy, right? Well, not really. The idea is that colliding asteroids brought water to Earth. Today, large asteroids hit Earth only once every 20 million years. Not enough to bring all that water, you think? True, but when Earth was a baby planet, these collisions were like a weekend asteroid party! More frequent, and asteroids had more water back then.

The great Water escape - sun vs. gravity 🌞

You might wonder why asteroids lost almost all of their water. It's the Sun's fault! The Sun's heat evaporated the water, and weak gravity couldn't hold it. It's like leaving a water bottle in the sun, but on a cosmic scale.

Earth’s water-saving superpowers 🌏

  • Earth's Perfect Spot in the Solar System: Earth's distance from the Sun keeps things cool enough so the water doesn’t boil. It's like Goldilocks - not too hot, not too cold. Liquid water sticks together because of hydrogen bonding - a unique connection between water molecules.

  • Earth's Gravity Holds It Tight: Earth's gravity is like a big hug for water, holding oceans and even gases within the atmosphere. Some gases may escape, but water vapor stays with us. It's like putting a lid on a pot to keep the steam in!

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IB Resources
Theme A - Unity & Diversity
Biology SL
Biology SL

Theme A - Unity & Diversity

Unlocking Earth’s Water An Extraplanetary Mystery

Word Count Emoji
541 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 14th Jun 2024

Table of content

How did Earth get all this water? 🚀

Earth's got a lot of water! About 1.4 billion cubic kilometers of it, and 98.3% is liquid. So where did it all come from? Imagine a pot of water boiling away - that's what Earth's surface would have been like when it formed. So, the water had to come later. But how? Let's explore!

The asteroid water delivery service 💥

One theory is that Earth ordered water from an "asteroid delivery service"! Sounds crazy, right? Well, not really. The idea is that colliding asteroids brought water to Earth. Today, large asteroids hit Earth only once every 20 million years. Not enough to bring all that water, you think? True, but when Earth was a baby planet, these collisions were like a weekend asteroid party! More frequent, and asteroids had more water back then.

The great Water escape - sun vs. gravity 🌞

You might wonder why asteroids lost almost all of their water. It's the Sun's fault! The Sun's heat evaporated the water, and weak gravity couldn't hold it. It's like leaving a water bottle in the sun, but on a cosmic scale.

Earth’s water-saving superpowers 🌏

  • Earth's Perfect Spot in the Solar System: Earth's distance from the Sun keeps things cool enough so the water doesn’t boil. It's like Goldilocks - not too hot, not too cold. Liquid water sticks together because of hydrogen bonding - a unique connection between water molecules.

  • Earth's Gravity Holds It Tight: Earth's gravity is like a big hug for water, holding oceans and even gases within the atmosphere. Some gases may escape, but water vapor stays with us. It's like putting a lid on a pot to keep the steam in!

Unlock the Full Content! File Is Locked Emoji

Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟