science

Melas Chasma

Melas Chasma is a 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 Melas Chasma rather than just read about it. In short: Melas Chasma is a canyon on Mars, the widest segment of the Valles Marineris canyon system, located east of Ius Chasma at 9.8°S, 283.6°E in Coprates quadrangle. It cuts through layered deposits that are thought to be sediments from an old lake that resulted from runoff of the valley networks to the west.

Key takeaways

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

Reference excerpt

Melas Chasma is a canyon on Mars, the widest segment of the Valles Marineris canyon system, located east of Ius Chasma at 9.8°S, 283.6°E in Coprates quadrangle. It cuts through layered deposits that are thought to be sediments from an old lake that resulted from runoff of the valley networks to the west. Other theories include windblown sediment deposits and volcanic ash. Support for abundant, past water in Melas Chasma is the discovery by MRO of hydrated sulfates. In addition, sulfate and iron oxides were found by the same satellite. Although not chosen as one of the finalists, it was one of eight potential landing sites for the Mars 2020 rover, a mission with a focus on astrobiology. The floor of Melas Chasma is about 70% younger massive material that is thought to be volcanic ash whipped up by the wind into eolian features. It also contains rough floor material from the erosion of the canyon walls. Around the edges of Melas is also much slide material. In a recent study of southwestern Melas Chasma using high-resolution image, topographic and spectral datasets eleven fan-shaped landforms were found. These fans add to growing evidence that Melas Chasma once held a lake that had fluctuating levels. Using HiRISE images, CTX images, and DEM's, a team of researchers mapped many channels and inverted channels in Melas Chasma. A digital elevation model (DEM) is a digital model or 3D representation of a terrain's surface. In addition, they found dendritic networks of channels in the plateaus just above the Chasma. Channels appeared to have formed at different times, hence there were "wet-dry" phases in the history of Melas Chasma. The whole region may have had liquid water for extended periods in the early Hesperian.

See also Chasma Coprates quadrangle Digital elevation model Geology of Mars HiRISE Inverted relief Lakes on Mars

References

External links Metz, Joannah M.; John P. Grotzinger; David Mohrig; Ralph Milliken; Bradford Prather; Carlos Pirmez; Alfred S. McEwen & Catherine M. Weitz (2009). "Sublacustrine depositional fans in southwest Melas Chasma". Journal of Geophysical Research. 114 (E10002). Bibcode:2009JGRE..11410002M. doi:10.1029/2009JE003365. [1] Lakes on Mars - Nathalie Cabrol (SETI Talks) NASA Astronomy Picture of the Day: Melas, Candor and Ophir: Valleys of Mariner (17 February 2005)

Illustrations

Worked examples

Example 1 — a first encounter with Melas Chasma

Start with the simplest possible case. Write down what Melas Chasma claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Melas Chasma 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 Melas Chasma 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 Melas Chasma

In research: Melas Chasma appears in 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 Melas Chasma 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: Melas Chasma is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coprates quadrangle, Mars 2020, Valleys and canyons on Mars, so understanding it makes those chapters shorter.
In everyday life: Look for Melas Chasma 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 Melas Chasma in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Melas Chasma 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 Melas Chasma out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Melas Chasma in simple terms?

Why does Melas Chasma matter?

Because it connects several 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 Melas Chasma?

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 Melas Chasma.