Notes, summaries, assignments, exams, and problems for Geology

Plate Tectonics: Key Concepts

• Biological Puzzles

  The existence of land bridges or island chains that connected the ancient continents.

• Geographic Enigmas

  The outer edge of the continent is under the sea where the continental shelf terminates.

• Geological Riddles

  There is a correspondence between geological structures present on both sides of the Atlantic Ocean.

Scenarios of Continental Drift

According to Wegener, all continents were part of a large landmass (supercontinent called Pangea).

• Paleomagnetic Tests

  During the cooling of lava, ferrous minerals align. Studying these minerals indicates the position of the north pole.

• Oceanographic Evidence

  The discovery of the oceanic ridge system that splits the great oceans.

• Seafloor Spreading Hypothesis

  Harry Hess

Chapter 5 - River Systems

How rivers and streams work – Gradient (know this!)

• Streamflow
  • Factors that determine velocity
  • Gradient, or slope
  • Channel characteristics
    • Shape
    • Size
    • Roughness
    • Discharge – volume of water flowing in the stream (generally expressed as cubic feet per second)
• Gradient highest nearest river source, where is it lowest?
• Upstream-downstream changes
  • Profile
  • Cross-sectional view of a stream
  • From head (source) to mouth
  • Profile is a smooth curve
  • Gradient decreases from the head to the mouth
  • Factors that increase downstream
    • Velocity
    • Discharge

Base level

Rivers flow and/or erode to the lowest level, ultimately to sea level

• Base level
  • Lowest point a stream can erode to
  • Two general types
    • Ultimate – sea level
    • Temporary, or local
  • Changing causes readjustment

Atmospheric Layers and Structure

The Troposphere

The troposphere concentrates the bulk of the atmosphere's mass and all moisture and dust particles. It extends up to 16 km in Ecuador and a minimum of 8 km at the poles. It is where all weather phenomena, such as wind and rain, develop.

The Ionosphere

Situated between 90 and 400 km, the ionosphere is ionized and reflects radio waves.

Environmental Impact Assessment

Declaration of Environmental Impact (EID)

Communication is required by law regarding predicted environmental consequences, and should include the following:

• Project description.
• Consideration of alternatives to actions that are performed.
• Environmental inventory prior to completion of the activity.
• Identification of anticipated impacts.
• Protective

Understanding Natural Resources

In human terms, a resource is anything we obtain from the environment to satisfy our needs and desires. All living things require basic resources such as food, water, and shelter. Some resources are directly usable, while others require effort or technology to become useful.

Types of Natural Resources

Perpetual Resources

These resources are virtually inexhaustible on human timescales. Examples include direct and indirect solar energy (wind, running water).

Non-Renewable Resources

Non-renewable resources exist in a fixed amount within the Earth's crust. They may form through natural processes, but over millions or billions of years (e.g., oil takes 600 million years to form). While complete exhaustion is rare, economic... Continue reading "Understanding Natural Resources: Types, Sustainability, and Challenges" »

Environmental Principles

• Principle of Sustainable Emission
• Principle of Zero Emissions
• Principle of Sustainable Technology Selection
• Precautionary Principle

Environmental Classifications

• Atlantic
• Mediterranean
• Continental
• Tropical
• Tree

Environmental Problems by Scale

Local Issues

• Formation of fog or smog pollutants
• Noise pollution
• Electromagnetic fields
• Bioaccumulative, toxic compounds

Regional Problems

• Acid rain
• Ionizing radiation pollution

Global Issues

• Greenhouse effect and climate change
• Destruction of the ozone layer

Ozone Layer Depletion

The stratospheric ozone absorbs UV radiation through continuous formation and destruction reactions, which are in dynamic equilibrium.

Between 1977 and 1984, it was revealed that the amount of ozone had decreased by 40% during... Continue reading "Environmental Challenges: Pollution, Ozone Depletion, and Acid Rain" »

Wood Diseases: Defects, Alterations, and Protection

Understanding Wood Defects

Wood can exhibit various issues that impact its quality and structural integrity. These can be broadly categorized into problems, defects, and alterations.

Common Wood Defects

• Problems: Knots, heart offset, and similar issues that occur during the tree's growth period.
• Defects: Modify the structural order, such as bark inclusions and double sapwood.
• Alterations: Include cracks, decay, and other forms of damage.

Qualities of Good Wood

A high-quality piece of wood typically possesses the following characteristics:

• Straight grain
• Regularity in the annual rings
• Fresh smell
• Absence of cracks
• Shiny and smooth surface when ripped

Specific Wood Defects Explained

• Knots: A localized anomaly

Landforms and Geological Agents

Forms of relief are shaped by geological agents and influenced by weather patterns.

Factors Influencing Landforms

• Weather
• Human population density
• Vegetation and fauna
• Ground viewpoint
• Subjective aspects

Geological Agents and Relief Modeling

Geological agents, such as rivers, play a crucial role in modeling relief:

• Rivers: Modeling river waters originates wild streams, U-shaped karst waters.
• Coastal wind: Wind modeling.

Climate is a significant factor influencing the type of landscape.

Geologic agents include weather, vegetation, wildlife, and human activities.

The atmosphere influences weather phenomena, climate temperature, and rainfall. Air tends to flow from anticyclones towards depressions, causing wind.

Weathering Processes

Weathering... Continue reading "Landforms and Geological Agents: Shaping Our Environment" »

Environmental Terms Defined

Environment

It's the natural world that surrounds us.

Drought

It's the lack of water and it's related to environmental problems.

Supply

It's the place where I obtain certain resources.

Population

People that live in a determinate place.

Dams

Constructions that are prepared to contain water.

Recycling

It is the process by which you use old material to create a new product.

Environmental Problems

Pollution

It's when the air, water, or earth are damaged or spoiled by gases, toxic waste, or garbage.

Famine

When there is a lack of water.

Species Becomes Extinct

The species disappear completely.

Deforestation

When trees are cut down massively.

The Greenhouse Effect

The gradual warming of the Earth's surface caused by an increase in pollution... Continue reading "Environmental and Weather Terms Defined" »

Psychology of Space

The psychology of space provides insight into how the proper environment makes a person feel and perform. Design elements like lines, space distribution, materials, color, textures, lighting, and installations all play a crucial role.

Lines in Design

Different types of lines can make spaces easier or more difficult to navigate, create dynamism or stability, unity or confusion within an environment. A predominance of vertical lines in a room makes the ceiling seem higher. Upholstered chairs with vertical stripes also produce a sensation of added height, while horizontal stripes make it seem lower. Parallel lines are always harmonious and characteristic, conveying a sense of pleasure and repetitive tranquility. Curved lines can... Continue reading "Space Psychology & Design Elements" »