Ecosystems and Environmental Factors: Impacts and Adaptations
Ecosystems and Environmental Factors
An ecosystem is a system formed by a group of organisms of different species (or biocenosis), the environment in which they live and its physical/chemical characteristics (or biotope), and the interactions that are established between them. Biocenoses are determined by many factors resulting from:
- The characteristics of the biotope.
- The actual presence or variations
1.1 Environmental Factors and Their Impacts
Environmental factors are all the components of the ecosystem
Read MoreAsphalt Emulsion Tests: A Comprehensive Guide
Asphalt Emulsion Tests
Electrical Charge Test
This test determines the electrical polarity of asphalt emulsion globules to identify if they are anionic (negative charge) or cationic (positive charge). An electrical current is induced through the emulsion using two electrodes, and the attraction of asphalt globules to the electrodes is observed.
pH Test
This test determines the potential hydrogen (pH) of the emulsion to identify the type: anionic emulsions are alkaline, while cationic emulsions are acidic.
Read MoreHuman Impact on the Environment: Understanding the Environmental Crisis
The Human Impact on the Environment
1. Natural Resources
Natural resources are materials derived from nature that humans use to satisfy their basic needs and desires. These resources are categorized as:
- Non-renewable resources: Exist in fixed amounts on Earth and are generated over long geological periods.
- Renewable resources: Replenish naturally at a rate faster than their consumption.
- Potentially renewable resources: Can be replenished naturally but are susceptible to depletion if overused.
Environmental
Read MoreUnderstanding the Geosphere: Structure, Seismic Waves, and Volcanic Hazards
ITEM 6: GEOSPHERE and Geohazards
Geosphere
The geosphere refers to the solid part of the Earth, encompassing everything beneath the Earth’s crust. It is the focus of study for phenomena related to the Earth’s internal dynamics, including its solid materials, surface features, and the planet as a whole.
Structure of the Geosphere
The geosphere’s structure can be categorized based on both physical and chemical composition:
Chemical Composition
- Core: Composed primarily of iron (Fe) and nickel (Ni).
- Mantle:
Plate Tectonics: A Comprehensive Guide to Earth’s Dynamic Surface
Plate Tectonics
Introduction
The thermal motion of the Earth’s interior causes significant changes on its surface, explained by the theory of plate tectonics. This theory proposes that the lithosphere, the Earth’s rigid outer layer, is divided into several fragments called tectonic plates. These plates move horizontally past one another, driven by convection currents and subduction. Numerous pieces of evidence support this theory, including the age of oceanic crust, heat flux in ocean basins, and
Read MorePaleoclimate Proxies and Earth’s Climate History
L15: Proxies of Paleoclimate I
Learning Objectives:
- Explain at least one way that understanding past climate helps our present understanding.
- Define “paleoproxy.”
- Explain the principles behind the four paleoproxies presented.
a. Why Look to the Past?
Studying past climate helps us understand the patterns of climate change better.
b. What is a Proxy?
A proxy is something that, in theory, closely tracks something else we cannot measure directly. For example, grades are a proxy for learning.
c. Paleoproxies
Paleoproxies
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