1.5M ratings
277k ratings

See, that’s what the app is perfect for.

Sounds perfect Wahhhh, I don’t wanna
scientificillustration
clawmarks

Atlas minerálu - Alexander Bernard - 1907 - via Internet Archive

Source: clawmarks

More you might like

amnhnyc
amnhnyc: “There are three kinds of rock: igneous, sedimentary, and metamorphic. Sedimentary rocks are layered. Some form when particles of rocks and minerals settle out of water or air. Others form when minerals precipitate directly out of water....
amnhnyc

There are three kinds of rock: igneous, sedimentary, and metamorphic. Sedimentary rocks are layered. Some form when particles of rocks and minerals settle out of water or air. Others form when minerals precipitate directly out of water. Sedimentary rocks are identified by their minerals and texture. As the sediments pile up, water is driven out by the weight of the overlying pile, and minerals precipitate around the sediment particles, cementing them into rock. This process is called lithification. 

spacetimewithstuartgary
earthstory

Views of a “Chondritic Meteorite” in thin section. This is a meteorite that was polished to only about 0.03 millimeters thick, thin enough that light can travel through the rocks. It is then put on a polarizing microscope and polarized light is sent through it. That gives you a chance to see some of the minerals and textures, but there is a second step here. A geologists microscope will have a second polarizer above the sample. That second polarizer can be rotated so that only light that had its direction changed by passing through the mineral reaches the eye of the viewer. This produces an effect called Birefringence, the colors seen in these grains. Birefringence colors can be used along with mineral textures to identify rock types.

This video shows the upper polarizer being rotated, so the light goes from singly-polarized to doubly polarized and colors appear as they do it.

The spherical blobs in this sample are the chondrules. They are thought to have been blobs of rapidly melted, rapidly cooled rock that floated out in space. Eventually they were assembled into rocks on some of the early asteroids.

Source: earthstory
the-telescope-times
the-telescope-times: “ ‘Quartz’ crystals at the Earth’s core power its magnetic field The Earth’s core consists mostly of a huge ball of liquid metal lying at 3000 km beneath its surface, surrounded by a mantle of hot rock. Notably, at such great...
the-telescope-times

‘Quartz’ crystals at the Earth’s core power its magnetic field

The Earth’s core consists mostly of a huge ball of liquid metal lying at 3000 km beneath its surface, surrounded by a mantle of hot rock. Notably, at such great depths, both the core and mantle are subject to extremely high pressures and temperatures. Furthermore, research indicates that the slow creeping flow of hot buoyant rocks–moving several centimeters per year–carries heat away from the core to the surface, resulting in a very gradual cooling of the core over geological time. However, the degree to which the Earth’s core has cooled since its formation is an area of intense debate amongst Earth scientists.

In 2013 Kei Hirose, now Director of the Earth-Life Science Institute (ELSI) at the Tokyo Institute of Technology (Tokyo Tech), reported that the Earth’s core may have cooled by as much as 1000?C since its formation 4.5 billion years ago. This large amount of cooling would be necessary to sustain the geomagnetic field, unless there was another as yet undiscovered source of energy. These results were a major surprise to the deep Earth community, and created what Peter Olson of Johns Hopkins University referred to as, “the New Core Heat Paradox”, in an article published in Science.

Read more ~ Eureka Alert

Image: The samples are heated under pressure to high temperatures of the core (about 4000 kelvins and higher) by being irradiated by a laser through diamonds.
    Credit: Tokyo Institute of Technology

scientificillustration
chaosophia218: “Antique scientific illustration depicting the Construction of a Sundial, 1700. A sundial is a device that tells the time of day by the apparent position of the Sun in the sky. In the narrowest sense of the word it consists of a flat...
chaosophia218

Antique scientific illustration depicting the Construction of a Sundial, 1700.

A sundial is a device that tells the time of day by the apparent position of the Sun in the sky. In the narrowest sense of the word it consists of a flat plate (the dial) and a gnomon which casts a shadow onto the dial. As the Sun appears to move across the sky, the shadow aligns with different hour-lines which are marked on the dial to indicate the time of day. The gnomon casts a broad shadow; the shadow of the style shows the time. The gnomon may be a rod, a wire or an elaborately decorated metal casting. The style must be parallel to the axis of the Earth’s rotation for the sundial to be accurate throughout the year. The style’s angle from horizontal is equal to the sundial’s geographical latitude.
In a broader sense, a sundial is any device that uses the sun’s altitude or azimuth (or both) to show the time. In addition to their time-telling function, sundials are valued as decorative objects, as literary metaphors and as objects of mathematical study.

Source: chaosophia218
See this in the app Show more