earth science

Mount Multnomah

Mount Multnomah 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 Mount Multnomah rather than just read about it. In short: Mount Multnomah is an invalidated hypothetical ancient volcano postulated in a 1925 publication by geologist Edwin T. Hodge.

Key takeaways

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

Reference excerpt

Mount Multnomah is an invalidated hypothetical ancient volcano postulated in a 1925 publication by geologist Edwin T. Hodge. It was proposed to exist in central Oregon at the present day location of the Three Sisters region. It was estimated to have been around 16,000-foot (4,900 m) tall, and was believed destroyed in a fashion similar to Mount Mazama's eruption resulting in what is now Crater Lake in southern Oregon. In 1924, Hodge performed fieldwork around the area and concluded that the three adjacent volcanoes and their foothills were once part of a single giant volcano. His conclusion was bolstered by oral history from the local Warm Springs tribe, which recounted the massive eruption and collapse of the ancient peak:

Klah Klahnee, the Three Sisters, was once the biggest and highest mountain of all; it could be seen for many miles. One time the earth shook for days, and the mountain boiled inside. It boiled over, and hot rocks came out of the top of it. Flames and smoke rose high in the air. Red hot stones were thrown out in every direction. Many villages and many Indians were buried by the rocks. When the mountain became quiet again, most of it was gone. Only three points were left. The date of eruption that Hodge calculated using the potassium-argon method was 25 million to 27 million years ago. This predates the earliest estimates of human presence in North America (see Settlement of the Americas) and even the earliest known humans (see Archaic Homo sapiens) by millions of years. Years later, Howel Williams, then dean of Cascade volcanologists, concluded that each of the Three Sisters and their surrounding mountains were unique and did not represent remains of a single collapsed structure.

Worked examples

Example 1 — a first encounter with Mount Multnomah

Start with the simplest possible case. Write down what Mount Multnomah 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 Mount Multnomah 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 Mount Multnomah 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 Mount Multnomah

In research: Mount Multnomah 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 Mount Multnomah 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: Mount Multnomah is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cascade Range, Cascade Volcanoes, Hypothetical volcanoes, so understanding it makes those chapters shorter.
In everyday life: Look for Mount Multnomah 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 Mount Multnomah in 20 minutes

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

Frequently asked questions

What is Mount Multnomah in simple terms?

Mount Multnomah is an invalidated hypothetical ancient volcano postulated in a 1925 publication by geologist Edwin T. Hodge.

Why does Mount Multnomah 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 Mount Multnomah?

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 Mount Multnomah.