earth science

Mousa Ali

Mousa Ali 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 Mousa Ali rather than just read about it. In short: Mousa Ali (Arabic: موسى علي, French: Mousa Alli, Italian: Moussa Ali) is a 2,021 metres (6,631 ft) stratovolcano located on the tri-point of Ethiopia, Eritrea and Djibouti. The volcano is the highest point in Djibouti.

Key takeaways

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

Reference excerpt

Mousa Ali (Arabic: موسى علي, French: Mousa Alli, Italian: Moussa Ali) is a 2,021 metres (6,631 ft) stratovolcano located on the tri-point of Ethiopia, Eritrea and Djibouti. The volcano is the highest point in Djibouti. The volcano's summit is truncated by a caldera, which contains rhyolitic lava domes and lava flows. The last known eruption occurred before the Holocene epoch. Mousa Ali is situated at the tri-point of the Tadjourah Region of Djibouti, the Southern Red Sea Region of Eritrea, and the Afar Region of Ethiopia.

Geography

The mountain has two distinct summits, the higher being the south one with an elevation of 2,021 metres. The north summit in Ethiopia has an elevation of 1,871 metres. Both summits are separated by a large caldera, about 1 km (0.71 mi) wide and 1514 metres deep. Mousa Ali, in the northern part of the Great Rift Valley region, has Eritrea on its northern flank, Ethiopia on the west, and Djibouti the east and south. The Djiboutian town of Dorra is 36 km to the south-southeast, the Ethiopian volcano Manda-Inakir is 22 km to the southwest, and the road from the Ethiopian town of Manda to the Eritrean port of Assab is 19 km to the northwest.

Wildlife and flora The mountain is home to an abundance of wildlife, lush vegetation, flowering shrubs and trees and various plants.

History Two sects of Afar live in the area. They are collectively known as Adrúmmi, from 'Adó rum li or "white as Byzantines." The position of Ali Mousa as the tripoint between Ethiopia, Eritrea and Djibouti is not the result of an agreement between the three countries. In December 1948 the British administering Eritrea refused to attend a meeting with the other two parties to determine the exact location of their tripoint, set in a 1908 treaty as 60 km inland from the Red Sea. British administration of Eritrea ended in 1952, and with increasing Ethiopian administration over the ensuing decade, and incorporation into Ethiopia from 1962 to 1993, the boundary was internal, not international. In 2002, the Eritrea-Ethiopia Boundary Commission established the tri-point at the Mousa Ali summit; Ethiopia had pressed for it to be further east, nearer to Dadda'to, Djibouti.

Climate The temperature of Mousa Ali usually ranges from 7 °C to 17 °C in December and January, and 16 °C to 26 °C from June to September. The weather on the mountain can be very erratic, sometimes severe.

Gallery

See also List of volcanoes in Eritrea List of stratovolcanoes List of Ultras of Africa

References

Illustrations

Worked examples

Example 1 — a first encounter with Mousa Ali

Start with the simplest possible case. Write down what Mousa Ali 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 Mousa Ali 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 Mousa Ali 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 Mousa Ali

In research: Mousa Ali 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 Mousa Ali 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: Mousa Ali is common in secondary-school and first-year university syllabi. It links to neighbouring topics Border tripoints, Djibouti–Eritrea border, Djibouti–Ethiopia border, so understanding it makes those chapters shorter.
In everyday life: Look for Mousa Ali 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 Mousa Ali in 20 minutes

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

Frequently asked questions

What is Mousa Ali in simple terms?

Why does Mousa Ali 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 Mousa Ali?

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 Mousa Ali.