Explain which is the largest reef?

449

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Explain how do minerals become rocks and rocks become soil?

435

---

Define loam soil?

480

---

Explain the earths core made of?

411

---

Explain what makes mountains appear purple?

414

---

Explain which carbonate mineral reacts readily with cool dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas?

438

---

Explain how has the earth changed since it was formed?

450

---

Explain what does a geologist do on a typical day?

431

---

Explain the name of the largest volcano in the world?

414

---

Explain the earths crust made of?

409

---

Explain how are the layers of schist separated into alternating light and dark minerals?

392

---

Define granite?

401

---

Describe the formation of sedimentary rocks?

433

---

Explain why does a glacier move?

409

---

Describe the formation of metamorphic rocks?

437

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