Earth science exam

Earth Science Notes

Water Resources

  • Overview: A once beautiful land surrounded by a bay, thriving with wildlife, now suffers from pollution due to human activities.

Early Inhabitants

  • Massachuseuck People:

  • Lived near the bay and relied on fishing and shellfish.

  • Contributed to pollution by dumping garbage into the bay.

Development and Pollution

  • European Settlers:

  • Expanded the land, creating a larger town (New Bedford) and increasing pollution.

  • Filled in salt marshes for land development, leading to erosion and runoff.

Environmental Impact

  • Pollution Sources:

  • Sewage from households and waste from the streets flowed directly into the bay.

  • Loss of natural filters (salt marshes & vegetation), exacerbating pollution issues.

Reflection Questions:

  • Would you want to swim in this bay?

  • Would you eat fish caught in this water?

  • Would you like to go boating on this bay?

Origin of the Universe

  • Big Bang Theory:

  • Introduced by George Lemaitre in 1927, supported by Edwin Hubble in 1929 with telescope evidence.

  • The universe originated from a singularity—a dense point that expanded.

  • Cosmic Microwave Background (CMB): Evidence supporting the Big Bang; photons cool and transition to radiation.

Solar System Formation

  • Solar Nebula Theory: Describes processes leading to solar system formation.

  1. Collapse and contraction of solar nebula.

  2. Rotation leading to formation of the Sun.

  3. Condensation of minerals.

  4. Formation of terrestrial planets.

  5. Formation of gas giants.

Mineral Resources

  • Characteristics of Minerals:

  • Luster: Light reflection quality.

  • Tenacity: Resistance to being broken.

  • Hardness: Strength measurement.

  • Streak: Color of powdered mineral.

  • Cleavage: Breakage patterns of minerals.

  • Mineral Requirements:

  1. Naturally occurring.

  2. Inorganic/Abiogenic.

  3. Stable at room temperature.

  4. Defined chemical composition.

  5. Ordered internal structure.

Rock Resources

  • Definition: Rock is an amorphous aggregate of minerals without a crystal structure.

  • Magma Generation: Requires high temperature and low pressure, leading to different types of magma such as basaltic which solidifies quickly.

Energy Resources

  • Renewable Energy: Can be replenished naturally (e.g., solar, hydroelectric, wind).

  • Non-renewable Energy: Finite resources (e.g., fossil fuels like coal, oil, and nuclear).

Soil Resources

  • Types of Soil:

  • Sand: Smallest soil particle.

  • Loam: Fertile and ideal for agriculture.

  • Clay: Slightly compacted.

  • Soil Formation Stages:

  • Immature Soil: Early stage, barren.

  • Mature Soil: All soil layers present.

  • Organic Matter: Critical for agricultural productivity.

Weathering Processes

  • Exogenic Processes: External geological processes affecting the earth.

  • Mechanical Weathering: e.g., frost wedging.

  • Chemical Weathering: Involves chemical reactions such as oxidation and dissolution.

Endogenic Processes

  • Earthquakes: Result from tectonic movements in the lithosphere.

  • Plate Tectonics: Large segments of the lithosphere interacting with each other, causing geological activity.

Additional Notes

  • Please Use Responsibly: This reviewer is meant for study purposes only, not for cheating. Analyze content for better understanding.