Biology HL
Biology HL
4
Chapters
553
Notes
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 HL
Biology HL

Theme A - Unity & diversity

Explore Earth & Titan's Ancient Secrets!

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

Table of content

Formation of Earth & the pre-biotic period

  • Sun's Birthday: About 4,500 million years ago, two-thirds of the Universe's age.
  • Earth's Baby Steps: Gravity mushed gas and dust together to create Earth.
  • Life? Nope!: Initially, no life. Just gases, but not like today.

Ancient air - what was breathing like?

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

Mysterious oceans

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

Sunbathing on early Earth

  • Ozone: Nope, wasn't around! So, more solar UV rays partied on Earth's surface.
  • UV Rays: High-energy party crashers causing chemical reactions.
  • Lightning? More!: Possibly more lightning, triggering unexpected chemical reactions.

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IB Resources
Theme A - Unity & diversity
Biology HL
Biology HL

Theme A - Unity & diversity

Explore Earth & Titan's Ancient Secrets!

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

Table of content

Formation of Earth & the pre-biotic period

  • Sun's Birthday: About 4,500 million years ago, two-thirds of the Universe's age.
  • Earth's Baby Steps: Gravity mushed gas and dust together to create Earth.
  • Life? Nope!: Initially, no life. Just gases, but not like today.

Ancient air - what was breathing like?

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

Mysterious oceans

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

Sunbathing on early Earth

  • Ozone: Nope, wasn't around! So, more solar UV rays partied on Earth's surface.
  • UV Rays: High-energy party crashers causing chemical reactions.
  • Lightning? More!: Possibly more lightning, triggering unexpected chemical reactions.

Unlock the Full Content! File Is Locked Emoji

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