Geological Events, Dating Methods, and Fossilization
Geological Events and Dating
Sequence of Events
To order past geological events chronologically, we use the principles of horizontality and superposition of strata. Another approach is the principle of cross-cutting relationships. This principle states that anything that affects geological materials and structures is post-dated to them. Because it establishes the order in which events unfold, it’s also called the principle of succession of events.
Geological Dating Methods
Radioactive Isotopes
Each chemical
Read MoreVentilated Facades: Benefits and Design
Advantages of Ventilated Facades
Ventilated constructions offer thermal, aesthetic, and waterproofing benefits to buildings. They prevent overheating in summer, provide water protection, and allow vapor diffusion from the inside to the outside. This ensures optimal moisture regulation and makes it easy to adapt to current and future energy standards. Ventilated facades also offer endless design possibilities.
Air Gap
The air gap should be a minimum of 25mm and as much as necessary, provided there
Read MoreUnderstanding Terrain: A Comprehensive Guide to Landforms
Terrain: Understanding Earth’s Diverse Landforms
Terrain: The physical features of a tract of land.
Erosion Features
Band: A form of sediment erosion on loamy-clay materials in a semi-arid environment, strongly dissected by the intense action of water.
Landscapes
Countryside: Lowlands alternating with layers of clay, sandstone, and other sedimentary rocks, characterized by their soft modeling.
Elevations
Cerro Witness: A stratified elevation that represents the residue of a horizontal platform eroded over
Read MoreEnvironmental Stressors: Population, Atmosphere, and Water Impact
Environmental Stressors
Environmental Stress: Atmosphere, water, oceans, soil, forests, species. Causes: Human population growth, overconsumption, pollution. Environmental Quality Control Concepts: Sustainability, sustainable development, ecological sustainability, ecosystem approach, precautionary principle, environmental stewardship.
Population Growth and Environmental Pressures
Thomas Malthus: Food is necessary for existence but is finite. Exponential reproductive rates affect population growth.
Read MoreBiodiversity Conservation: Threats and Solutions
Economic Reasons for Conserving Biodiversity
Raw materials, food, health, and ecosystem stability are all vital economic reasons for conserving biodiversity.
Living Planet Index: Indicates the abundance of species populations. A species is considered endangered when it reaches a critical number, which is the minimum population size needed for recovery.
Causes of Biodiversity Loss
- Habitat Loss and Degradation (Anthropogenic): Human activities are the primary cause.
- Habitat Fragmentation: For example,
Plate Tectonics: Transform & Convergent Boundaries
Neutral Edges: Interactions
When two plates move horizontally in opposite directions, they are also known as transform faults, passive margins, or conservative margins. Oceanic lithosphere is neither created nor destroyed.
The Origin of Transform Faults
The origin of transform faults is not very clear. Some scientists believe that these fractures are inherited from when the old continent opened to form the ocean. Others say that their genesis is related to the plate movement described, which diverges
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