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A fertilizer is an organic or inorganic material, natural or synthetic, that is added to a soil to supply plant nutrients essential to their growth.
We can clasificate them in inorganic, which are synthesized using one product that produces amonia, and in organic fertilizer, which come from organic materials like manure, worm castings, compost, seaweed or saltpeter.
But a use of fertilizers in excess can cause serious enviromental effects like: Eutrophication, Blue baby syndrome, soil acidification, persistent organic polluant, radioactive elment accumulation… The use of fertilizers contributes to Global Warming too, to the pollutants and soil degradation.
Al degradate soil by fertilizers.
One example of symbiosis is the Lichen wich is composed of one algae and a fungi.
Image taken from Google images.
Chromatin: Is the combitation of DNA, histoine and other proteins that makes up chromosomes. It is found in the nuclear envelope of eukariotic cells.
Chromatids: Is one of the two identical copies of DNA making up a duplicated chromosome, wich are joined at their centromeres.
Chromosome: Is an organized structure of DNA and protein that is found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucletoide sequence.
Kinetochore: Is the protein structured on chromosomes where the spindle fibres attach during the cell division to pull the chromosomes apart.
Interphase: Is the phase of th cells cycle in which the cell spends the majority of its time and preforms the majority of its purposes, including preparation to cell division.
Cytokinesis: Is the process in which the cytoplasm of a single eukariotic cell is divided to form two daughter cells.
By: Belén Mercader (she loves biology 😀 )
An earthquake is the result of a sudden release of energy in the Earth’s crust that creates the seismic waves.
Earthquakes are measured with a seismometer
The magnitude of an earthquake is the quantity of energy releases, it is measured by the Ritchter scale.
The Intensity of an earthquake are the damages caused in a poblated area, it is measured by the Mercalli scale.
The point where the earthquake is formed above the Earth’s cruts is called epicentre, and the point where is the rupture of an earthquake is calle hypocentre or focus, it is directly below the epicentre.
The causes or effects of earthquakes are: volcanoes, folds and faults.