Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.
Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.
Hungarian King Władysław I died in the lost battle fought against the Ottomans.
Buildings constructed of prefabricated concrete blocks were widespread in the former Socialist countries.
Hypochlorite ions are formed when water is disinfected with chlorine.
A helical molecule consisting of alpha-D-glucose units. It is one of the basic components of starch.
Fibroin is a fibrillar protein excreted by silkworms.
Alpha-D-glucose is one of the stereoisomers of glucoses, specifically the D-glucoses.
A colourless, viscous liquid, a highly corrosive, strong acid used in several industrial processes.
Potassium permanganate is used as a disinfectant.
A light yellow compound formed in the reaction of silver nitrate and potassium iodide.
Common salt (or table salt) is one of the most important sodium compounds, indispensable for living organisms.
A white, crystalline compound which breaks down when exposed to light.
Colourless, odourless gas, highly toxic to humans and animals in high concentration.
A heterocyclic organic compound, its derivatives are thymine, cytosine and uracil.
Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.
A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.
A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.
The simplest aldose, an optically active compound.
Halogen elements are a group in the periodic table consisting of five chemically related elements, fluorine, chlorine, bromine, iodine, and astatine.