earth science

Sotra Patera

Sotra Patera is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sotra Patera rather than just read about it. In short: Sotra Patera (named after Sotra island in Norway) is a prominent depression on Titan, the largest moon of Saturn. It was formerly known as Sotra Facula; the current name was approved on 19 December 2012.

Key takeaways

Sotra Patera belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sotra Patera to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sotra Patera from memory before moving on to harder problems.

Reference excerpt

Sotra Patera (named after Sotra island in Norway) is a prominent depression on Titan, the largest moon of Saturn. It was formerly known as Sotra Facula; the current name was approved on 19 December 2012. It is a possible cryovolcanic caldera 30 km (19 mi) across and 1.7 km (1.1 mi) deep, and is immediately to the east of the largest putative cryovolcanic mountain on Titan, the 1.45 km (0.90 mi) high Doom Mons. Sotra Patera is the deepest known pit on Titan. The ice volcano or cryovolcano Doom Mons forms a roughly circular mountain measuring about 65 kilometres (40 mi) across. It has two peaks standing about 1,000 metres (3,300 ft) and 1,450 metres (4,760 ft) high with multiple craters, with Sotra Patera at 1,700 metres (5,600 ft) being the deepest. Finger-like flows are visible on the flanks of the mountain, measuring perhaps 100 metres (330 ft) thick.

The Cassini–Huygens mission has mapped Sotra Patera using the Cassini orbiter's onboard radar instrument and the visual and infrared mapping spectrometer. An earlier survey of the region in 2004 revealed a circular bright spot, or facula, which was nicknamed "The Rose". A subsequent flyby by Cassini re-surveyed the region from a different angle, enabling members of the US Geological Survey Astrogeology Science Center to generate stereoscopic mapping of Sotra Patera and the surrounding area. Researchers also discovered at least two more mountains and another big crater, forming a chain of mountains several hundred kilometers long flanked by lava-covered lowlands. With Doom Mons, Sotra Patera is regarded as "the very best evidence, by far, for volcanic topography anywhere documented on an icy satellite", according to planetary scientist Jeffrey Kargel of the University of Arizona. It has been compared with terrestrial volcanoes such as Etna, Laki and volcanic cones near Flagstaff, Arizona. There is as yet no evidence of current activity, but researchers plan to monitor the area for changes. It is unclear what might have been erupted from Sotra Patera—possibly water mixed with ammonium, or more exotic hydrocarbon compounds such as polyethylene, paraffin waxes or asphalt. The eruptions may also have brought methane to the surface. Titan's dense methane atmosphere is constantly being broken down by sunlight in the upper atmosphere through photolysis; cryovolcanism may therefore explain how the atmosphere is being replenished. The eruptions of Sotra Patera are presumed to originate in a layer of liquid water lying below Titan's icy crust. The mountain's heavily cratered appearance indicates that it must have erupted with considerable force, but the precise mechanism by which this happened is not certain. Liquid water is ordinarily denser than ice but it is possible that the water's density may be reduced by mixing with other substances, such as ammonia, allowing it to force its way to the surface. Alternatively, some other mechanism such as the underground formation of methane bubbles or a build-up of tectonic pressure may be responsible.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sotra Patera

Start with the simplest possible case. Write down what Sotra Patera claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sotra Patera before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sotra Patera ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sotra Patera

In research: Sotra Patera appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sotra Patera in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sotra Patera is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extraterrestrial volcanoes, Surface features of Titan (moon), so understanding it makes those chapters shorter.
In everyday life: Look for Sotra Patera outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sotra Patera in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sotra Patera means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sotra Patera out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sotra Patera in simple terms?

Why does Sotra Patera matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sotra Patera?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sotra Patera.