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

Bangladesh River Flooding: 1998 Case Study

Geographical Context and Vulnerability

Bangladesh is formed by deposition from three major rivers: the Brahmaputra, the Ganges, and the Meghna. Sediment from these and over 50 other rivers forms one of the largest deltas in the world. Up to 80% of the country is located on this delta. As a result, much of the country is just a few meters above sea level and is highly vulnerable to flooding and rising sea levels.

Bangladesh is a densely populated country (an LEDC) with a high population growth rate (nearly 2.7% per annum). Almost all of Bangladesh’s rivers have their source outside of the country. For example, the drainage basin of the Ganges and Brahmaputra covers 1.75 million km² and includes the... Continue reading "Bangladesh River Floods: Causes, Impacts, and Mitigation (1998 Case Study)" »

explicar el modelo geodinámico, hacer un dibujo, explicar cada capa y nombrar las discontinuidades?

There will come soft rains and the smell of the ground,
and swallows circling with their shimmering sound;
and frogs in the pools singing at night,
and wild plum-trees in tremulous white;
robins will wear their feathery fire
whistling their whims on a low fence-wire
and not one will know of the war, not one
will care at last when it is done
not one would mind, neither bird nor tree
if mankind perished utterly;
and spring herself, when she woke at dawn
would scarcely know that we were gone

Meeting at Night

the gray sea and the long black land; a
and the yellow half-moon large and low b
and the startled little waves that leap c
in fiery ringlets from their sleep c
as I gain the cove with pushing prow b
and quench its speed i' the slushy sand a

then a mile of warm... Continue reading "Poetic Reflections on Nature and Mortality" »

Environmental Pollution

The negative change of the characteristics of the environment is called Pollution /Clouds containing Sulphur oxides (SOx) produce acid rain/ The depletion that human activities are causing in some products is Exhaustion of raw materials/ The presence in soil of substances in concentrations sufficient to confer harmful, unhealthy or hazardous properties is the Land pollution/ The Sustainable development considers the improvement of living conditions along with the stable ecological balance at the local, regional and global maintenance/ The substance that is opaque to ultraviolet (UV) light, and it blocks about 96% of the UV light that comes from the sun isOzone/ A land-fill site is A big hole that we make in ground to

Sources of Petroleum

Petroleum originates from a small fraction of the organic matter deposited in sedimentary environments.

“Source Rock”

The typical “source rock” contains 99% mineral matter and 1% organic matter. The organic matter is composed of 90% kerogen and 10% bitumens.

This organic matter is usually a combination of marine- and terrestrially-derived organic matter (plant) and zooplankton (animal), which constitutes more than 95% of the life in the oceans.

Terrestrial organisms are mainly wind-blown spores and pollen, along with some woody debris from rivers and swamps.

All living matter is composed of four main constituents: lipids, proteins, carbohydrates, and lignins.

Kerogen Types

1. Type I Kerogen

This type of kerogen has a high... Continue reading "Petroleum Sources: Kerogen Types and Their Significance" »

Biodiversity

Biodiversity = Number, variety and variability of Earth’s organisms (of plants and animals)

Levels of Biodiversity

1. Genetic Diversity - The genetic variety within all populations of that species.

2. Species Richness - The number of species

3. Ecosystem Diversity - The variety of ecosystem found on earth. Ex, The forests, prairies, deserts, coral reefs, lakes

Endangerment and Extinction

Species of imminent danger of extinction throughout all or a significant portion of its range.

The death of the last individual of a species.

Leading Causes of Endangerment and Extinction

• -land use of biodiversity hotspots(biggest contributor to species loss)
• -The introduction of a foreign species into an ecosystem from  which it did not evolve.
• -Overexploitation:

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i'm writting about my concern relating to Deforestation in my area. In my opinion , i think it's dangerous.

Firstlly,  they Belive that cutting the trees will grow immediately,  but it isn't. Secondly, when they cut the Trees the animals are homeless and many species became extinct. Thirdly , can Cause changes in climate. Having fewer forest means emit more amount of Greenhouse gases. Plants and animals balances out the amount of oxygen And carbon dioxide in the air. Plants take in carbon dioxide and release oxygen While, on the other hand, animals take in oxygen and release carbon dioxide. Deforestation can unbalance the cycle by killing trees and other plants. 

if more people write about suggestions , we will have a better service.... Continue reading "Air law" »

The Composition and Classification of Rocks

Rock is any natural, inorganic material made up of one or more minerals. Rock forms the solid part of the Earth's crust.

Rocks formed of only one type of mineral are called mono-mineralic rocks, but rocks are usually formed of more than one mineral.

Exceptions to the Definition

There are two notable exceptions often referred to as 'rocks':

• Oil: Considered a liquid 'rock'.
• Coal: Formed from the remains of plants (organic material).

The Three Main Types of Rocks

Rocks are classified into three primary types based on their formation process:

1. Igneous Rocks: Rocks formed when magma cools and solidifies. (Magma is molten rock.)
2. Sedimentary Rocks: Rocks formed by the accumulation and cementation of fragments of other

Understanding Major Pollution Types and Mitigation Strategies

Air Pollution: Effects and Solutions

Effects of Air Pollution

• Acidification: Chemical reactions involving air pollutants create acidic compounds that harm vegetation and buildings.
• Eutrophication: Rain carries and deposits nitrogen from pollutants onto rivers and soils.
• Ground-level Ozone: Chemical reactions involving air pollutants create ozone, a poisonous gas.
• Particulate Matter: Air pollutants in this form are highly detrimental to human health.

Preventing Air Pollution

Government and Community Level Prevention

• Using renewable green energy sources (e.g., wind, solar).
• Enforcing regulations that compel companies to control the pollution they cause.
• Promoting the use of energy-efficient vehicles.