earth science

Petr Jakeš

Petr Jakeš 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 Petr Jakeš rather than just read about it. In short: Petr Jakeš (2 May 1940 in Břehy – 29 November 2005 in Prague) was a Czech geologist and geochemist. He dealt mainly with geochemical and volcanic processes on Earth and on celestial bodies, research on meteorites and lunar rocks.

Key takeaways

Petr Jakeš 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 Petr Jakeš to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Petr Jakeš from memory before moving on to harder problems.

Reference excerpt

Petr Jakeš (2 May 1940 in Břehy – 29 November 2005 in Prague) was a Czech geologist and geochemist. He dealt mainly with geochemical and volcanic processes on Earth and on celestial bodies, research on meteorites and lunar rocks. Jakeš and his colleague Josip Kleczek co-authored the 1985 general reference book The Universe and Planet Earth; it was translated into English by Stephen Finn and published in North America and Europe in 1987 by Octopus Books.

References

External links The Universe and Planet Earth at the Internet Archive

Illustrations

Petr Jakeš: Petr Jakeš in 2003 — Petr Jakeš in 2003

Worked examples

Example 1 — a first encounter with Petr Jakeš

Start with the simplest possible case. Write down what Petr Jakeš 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 Petr Jakeš 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 Petr Jakeš 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 Petr Jakeš

In research: Petr Jakeš 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 Petr Jakeš 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: Petr Jakeš is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1940 births, 2005 deaths, Czech astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Petr Jakeš 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 Petr Jakeš in 20 minutes

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

Frequently asked questions

What is Petr Jakeš in simple terms?

Why does Petr Jakeš 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 Petr Jakeš?

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 Petr Jakeš.