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'''Hydrology''' is a science concerned with the properties of the Earth's water, especially its movement in relation to land. ...ater in various forms. For students interested in off-world water, several lectures have been included. ...

{{main|Keynote lectures/Astronomy}} ...: let the symbol <math>\oplus</math> indicate the [[Keynote lectures/Earth|Earth]]. ...

==Planetary sciences== {{main|Planets/Sciences|Planetary sciences}} ...

...n''' is most commonly found as a term used in terrestrial and astrophysics sciences also an area, notably among the different sub-disciplines of [[geography]], ...ral galaxies. It is the brightest of the three galactic mergers closest to Earth, about 250 million light-years away in the constellation of Serpens, the Se ...

...n''' is most commonly found as a term used in terrestrial and astrophysics sciences also an area, notably among the different sub-disciplines of [[geography]], "Apart from the [[Earth|global]]continental regions, there are also hydrospheric and atmospheric re ...

...c storm is caused by a coronal mass ejection from the sun that strikes the Earth's atmosphere. These mass ejections contain large amounts of particles that |title=The Effects of Earth's Upper Atmosphere on Radio Signals ...

...ement in physics, as it was previously assumed that an object in motion on earth would always return to a state of rest unless acted on by a force. We now * [[Keynote lectures/Dates|Dates]] (Hadean) (173 kB) (31 August 2019) ...

As [[geography]] describes the features of the surface of the [[Earth]], '''heliography''' describes the surface features of Helios or the Sun, S ...uary 1, 1854 (JD 2398220.0) and rotating with the sidereal period of 25.38 Earth days.<ref name=Heliographic/> ...

...s]]. It "shows a half crescent due to the relative orientation of the Sun, Earth and Venus. The X-rays from Venus are produced by fluorescent radiation from [[Category:Atmospheric sciences/Lectures]] ...

* [[Keynote lectures/Astrophysics|Astrophysics]] (106 kB) (7 July 2019) * [[Draft:Atmospheric sciences|Atmospheric sciences]] (39 kB) (18 October 2019) ...

...shows some of the major units of geological time and definitive events of Earth history. Credit: [[c:user:Woudloper|Woudloper]].]] ...gy#Hadean|Hadean]] eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).<ref name ...

[[Image:Earth poster.svg|thumb|right|250px|Diagram is of the Earth. Credit: [[commons:User:Kelvinsong|Kelvinsong]].]] '''Geognosy''' is the science and theory of the constitution of the Earth. ...

'''Def.''' any "of several sciences that deal with living organisms"<ref name=BioscienceWikt>{{ cite web '''Def.''' any "of the sciences dealing with living organisms, such as biology and zoology"<ref name=LifeSc ...

{{main|Keynote lectures/Astronomy}} ...isher=Royal Meteorological Institute of Belgium; Royal Academy of Overseas Sciences ...

...nsisting mainly of hydrocarbons, occurring naturally in deposits under the Earth's surface"<ref name=PetroleumWikt>{{ cite book '''Def.''' "one of the major groups of rock that makes up the crust of the Earth; formed by the deposition of either the weathered remains of other rocks, t ...

==Galactic sciences== {{main|Stars/Galaxies/Sciences|Galactic sciences}} ...

...tion rate of cosmogenic ³⁶Cl in bedrock and regolith exposed at Earth's surface is dependent on its calcium, potassium, and chloride content and The theory: "Earth’s Moon was struck by a tiny dwarf planet long ago".<ref name=Wehner/> ...

==Planetary sciences== {{main|Planets/Sciences|Planetary sciences}} ...

...eld together by intramolecular bonds. Although liquid water is abundant on Earth, this state of matter is actually the least common in the known universe, b ...ing.jpg|thumb|right|250px|Pudding is made in Denmark among other places on Earth. Credit: [[:da:wikipedia:User:Janada|Janada]].]] ...

...ton drip line is well established. For all elements occurring naturally on earth and having an odd number of protons, at least one species with a proton sep * [[Keynote lectures/Astrophysics|Astrophysics]] (106 kB) (7 July 2019) ...