science

Petrie (crater)

Petrie (crater) 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 Petrie (crater) rather than just read about it. In short: Petrie is a relatively small lunar impact crater on the far side of the Moon. Petrie is located to the east of the much larger walled plain Fabry.

Key takeaways

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

Reference excerpt

Petrie is a relatively small lunar impact crater on the far side of the Moon. Petrie is located to the east of the much larger walled plain Fabry. To the east of Petrie is the comparably sized crater Rayet. Most of the rim of Petrie is sharp-edged, with a deposit of scree along the base of the inner wall. There is an outward bulge to the rim along the southwest, where the surface has slumped into the interior. This formation was named after Canadian astronomer Robert M. Petrie (1906–1966) by the IAU in 1970.

Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Petrie.

References

Sources

Illustrations

Worked examples

Example 1 — a first encounter with Petrie (crater)

Start with the simplest possible case. Write down what Petrie (crater) 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 Petrie (crater) 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 Petrie (crater) 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 Petrie (crater)

In research: Petrie (crater) 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 Petrie (crater) 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: Petrie (crater) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Impact craters on the Moon, LQ06 quadrangle, so understanding it makes those chapters shorter.
In everyday life: Look for Petrie (crater) 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 Petrie (crater) in 20 minutes

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

Frequently asked questions

What is Petrie (crater) in simple terms?

Petrie is a relatively small lunar impact crater on the far side of the Moon. Petrie is located to the east of the much larger walled plain Fabry.

Why does Petrie (crater) 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 Petrie (crater)?

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 Petrie (crater).