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Earth and Life Science(Summarized Notes), Summaries of Biology

Biology

Earth and Life Science is the exciting study of our planet and the living things that call it home. From the depths of the oceans to the stars above, and from tiny cells to towering ecosystems, this subject explores how Earth works and how life thrives and evolves. It's where geology meets biology — unlocking the secrets of nature and our place in it!

Typology: Summaries

2023/2024

Uploaded on 06/08/2025

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EARTH AND LIFE SCIENCE —
SUMMARIZED NOTES
🌍PART I: EARTH SCIENCE
Earth Science is the study of the Earth’s
structure, components, processes, and place in
the universe. It helps us understand how
natural systems interact and change over time.
---
A. BRANCHES OF EARTH SCIENCE
Branch Focus:
1. Geology Study of the solid Earth—its
rocks, layers, and the processes that
shape it (earthquakes, volcanoes,
erosion).
2. Meteorology Study of the atmosphere
and weather patterns.
3. Astronomy Study of celestial bodies
(stars, planets, galaxies) and the
universe as a whole.
4. Oceanography Study of Earth’s oceans
—their physical and chemical
properties, currents, and ecosystems.
5. Environmental Science Study of
interactions between the Earth’s
systems and human activity.
Emphasis: These branches work together to
provide a full understanding of how Earth
functions as a dynamic system.
---
B. THE UNIVERSE AND THE SOLAR SYSTEM
1. Origin of the Universe
Big Bang Theory (13.8 billion years ago): The
universe began from an extremely hot and
dense state and has been expanding ever since.
Evidence: Cosmic Microwave Background
Radiation, Redshift of galaxies.
2. Formation of the Solar System
Nebular Hypothesis: A rotating cloud of gas and
dust (solar nebula) collapsed to form the Sun
and planets 4.6 billion years ago.
Components:
Sun
8 Planets
Dwarf planets ( Pluto)
Asteroids
Comets
Meteoroids
3. Earth as a Habitable Planet
Right Distance from the Sun (Goldilocks
Zone)
Presence of Water
Stable Climate and Atmosphere
Magnetic Field (protection from solar
radiation)
Emphasis: Earth's unique combination of
conditions makes life possible. Understanding
the universe helps explain Earth's formation
and features.
---
C. EARTH'S SUBSYSTEMS (THE FOUR
SPHERES)
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EARTH AND LIFE SCIENCE —

SUMMARIZED NOTES

🌍 PART I: EARTH SCIENCE

Earth Science is the study of the Earth’s structure, components, processes, and place in the universe. It helps us understand how natural systems interact and change over time.

A. BRANCHES OF EARTH SCIENCE

Branch Focus:

  1. Geology Study of the solid Earth—its rocks, layers, and the processes that shape it (earthquakes, volcanoes, erosion).
  2. Meteorology Study of the atmosphere and weather patterns.
  3. Astronomy Study of celestial bodies (stars, planets, galaxies) and the universe as a whole.
  4. Oceanography Study of Earth’s oceans —their physical and chemical properties, currents, and ecosystems.
  5. Environmental Science Study of interactions between the Earth’s systems and human activity. Emphasis: These branches work together to provide a full understanding of how Earth functions as a dynamic system.

B. THE UNIVERSE AND THE SOLAR SYSTEM

  1. Origin of the Universe Big Bang Theory (13.8 billion years ago): The universe began from an extremely hot and dense state and has been expanding ever since. Evidence: Cosmic Microwave Background Radiation, Redshift of galaxies. 2. Formation of the Solar System Nebular Hypothesis: A rotating cloud of gas and dust (solar nebula) collapsed to form the Sun and planets 4.6 billion years ago. Components:  Sun  8 Planets  Dwarf planets ( Pluto)  Asteroids  Comets  Meteoroids 3. Earth as a Habitable Planet  Right Distance from the Sun (Goldilocks Zone)  Presence of Water  Stable Climate and Atmosphere  Magnetic Field (protection from solar radiation) Emphasis: Earth's unique combination of conditions makes life possible. Understanding the universe helps explain Earth's formation and features.

C. EARTH'S SUBSYSTEMS (THE FOUR

SPHERES)

  1. Geosphere – Solid Earth (rocks, soil, mountains, landforms).
  3. Hydrosphere – All water (oceans, rivers, groundwater, glaciers).
  5. Atmosphere – Gases that surround Earth (air, clouds, weather).
  7. Biosphere – All living organisms (plants, animals, humans, microorganisms).

Interactions:  Volcanoes (Geosphere) affect air (Atmosphere) and climate.  Rain (Atmosphere) causes erosion (Geosphere).  Pollution (Biosphere) affects water quality (Hydrosphere). Emphasis: All spheres are interconnected. A change in one affects the others—essential to understanding natural systems and environmental issues.

D. ROCKS AND MINERALS

  1. Minerals:  Naturally occurring  Inorganic  Solid  Definite chemical composition  Crystalline structure
  2. Types of Rocks: Type: Formation: Examples: Igneous Cooled magma/lava Granite, basalt Sedimentary Compacted sediments Limestone, sandstone Metamorphic Changed by heat/pressure Marble, slate
  3. Rock Cycle: A continuous process of rock formation, breakdown, and transformation. Emphasis: Rocks and minerals provide insights into Earth’s history and are resources for society (building materials, energy).

E. EARTH’S INTERNAL STRUCTURE

Layer Description: Crust Outermost, solid layer (continental and oceanic) Mantle Semi-solid With convection currents that move tectonic plates Outer Core Liquid iron and nickel; generates magnetic field Inner Core Solid iron and nickel, due to immense pressure Emphasis: The internal heat drives geological processes like volcanic eruptions, earthquakes, and plate movement.

  1. Grow and develop
  2. Reproduce
  3. Adapt and evolve Emphasis: All living organisms must exhibit these traits to be considered alive.

C. CELL THEORY AND ORGANIZATION

  1. Cell Theory:  All living things are composed of cells.  The cell is the basic unit of life.  All cells come from pre-existing cells.
  2. Cell Types: Type Features Prokaryotic No nucleus (bacteria) Eukaryotic Has nucleus (plants )
  3. Levels of Biological Organization: Atom → Molecule → Organelle → Cell → Tissue → Organ → Organ System → Organism → Population → Community → Ecosystem → Biosphere Emphasis: Cells are the foundation of all life. Biological organization explains complexity from small to large scale.

D. PLANT AND ANIMAL SYSTEMS

  1. Plant Systems: Photosynthesis: CO₂ + H₂O + sunlight → glucose
  • O₂ Organs: Roots, stems, leaves, flowers Transport systems: Xylem and Phloem
  1. Animal Systems: Circulatory: Heart, blood vessels Respiratory: Lungs, oxygen exchange Digestive: Mouth to intestines Nervous: Brain, spinal cord, nerves Reproductive: Sexual reproduction (meiosis, fertilization) Emphasis: Organ systems work together to maintain homeostasis and support life functions.

E. GENETICS AND HEREDITY

DNA: Blueprint of life (A-T, G-C base pairs) Genes: Sections of DNA that code for traits Mendelian Inheritance: Dominant and recessive traits Mutations: Permanent changes in DNA

Meiosis: Cell division for reproduction Mitosis: Cell division for growth/repair Emphasis: Genetics explains how traits are passed on and how organisms evolve over generations.

F. EVOLUTION AND NATURAL SELECTION

Charles Darwin: Father of evolution Natural Selection: "Survival of the fittest" Adaptations: Beneficial traits increase survival Speciation: Formation of new species Fossils: Evidence of past life and evolution Emphasis: Evolution connects all life through common ancestry and explains biodiversity.

G. ECOLOGY AND ENVIRONMENTAL

INTERACTIONS

Ecosystem: Interactions between organisms and environment Food Chains and Webs: Producers (plants) Consumers (herbivores, carnivores) Decomposers (fungi, bacteria) Energy Flow: 10% rule (energy loss per trophic level) Biodiversity: Variety of life in ecosystems Human Impact: Pollution, habitat destruction, climate change Emphasis: Ecosystems are delicate. Biodiversity is essential for resilience. Humans have a responsibility to conserve Earth’s life systems.

INTEGRATION: EARTH AND LIFE SCIENCE CONNECTION Earth systems shape life (climate affects evolution). Life affects Earth (photosynthesis impacts atmosphere). Studying both together offers a holistic understanding of life and planet sustainability.

SUMMARY: WHY EARTH AND LIFE SCIENCE

MATTERS

 Promotes scientific literacy  Encourages environmental stewardship  Prepares students for scientific careers  Helps in disaster preparedness and sustainability