What was earth primordial atmosphere

Sulfate-reducing bacteria combined methane and sulfate radicals; other organisms capable of photosynthesis used the energy of sunlight to convert the abundant carbon dioxide and water into carbohydrates C6H12O6 and oxygen.

The reverse conversion of ozone back to oxygen releases heat; the ozone layer basically absorbs high-energy ultraviolet radiation and converts it to heat.

The cause of this mass extinction is thought to have been a series of volcanic events in Siberia that lasted for about one million years and released large volumes of carbon dioxide and gases containing sulfur, chlorine, and fluorine.

These bacteria, algae, and other plants produce oxygen by photosynthesis. Although most of this oxygen is used in respiration biological oxidation or in the atmospheric oxidation of the carbon-containing products, approximately 0.

Composition of Earth's Atmosphere Nitrogen. In the mesophere , matter exists as atoms. There is sufficient energy in electromagnetic radiation from the sun to break the chemical bonds in molecules. The very highest energy electromagnetic radiation that causes ionization is filtered out by absorbtion in the ionosphere.

The stratosphere is home to the ozone layer. In the stratosphere, the chemical bonds between oxygen atoms in molecular oxygen O 2 break and in ozone O 3 break when the molecules absorb ultraviolet radiation.

Movie 1 Movie 2. We expect this secondary atmosphere to be largely composed of water vapor H 2 0 and carbon dioxide CO 2 , with a little bit of sulfur S 2 and nitrogen N 2 thrown in. So why don't we have a CO 2 atmosphere like Venus, or even Mars? On Earth, the surface temperature is cool enough for H 2 0 to condense into water. CO 2 dissolves easily into water, and from there into surface rocks such as limestone. Scienze in classe.

International projects Projects involving students from around the world, of different ages, which allow students to learn new content and release their energy, through participation and discussion. Lab 4 energy A virtual thematic classroom, high school students linked from various parts of the world for 15 courses on the world of energy, organised by faculty of MIT in Boston and world-renowned experts.

Lab 4 energy. Necst We are a partner of the NECST project , the European Union programme that connects schools in Croatia, Holland, Norway and Italy in the creation of a digital platform for research and exchange of knowledge on energy production.

Schoolnet A storyboard full of texts and drawings to narrate one's country in an original manner: letting loose the imagination of children around the world in the edition. Download " The Beginning of life " pdf file. Download the junior version pdf file. Special reports. From the Multimedia section. Life from space According to some scientists life has always existed in the Universe just like the Universe Clonation and Future The ability to give life to identical organisms, called clonation Bio-luminescence Many sea animals, including a lot of fish and molluscs that live in the dark in the ocean depths Bacteria as Sherlock Holmes A drop of blood, a fragment of skin or a hair found on the scene of a crime can supply….

Bacteria as miners The ability of chemoautotrophic bacteria to take energy from