What is shale?

748

---

What is the earths core made of?

747

---

What is the earths crust made of?

803

---

What is granite?

771

---

How were sedimentary rocks created?

787

---

What is the earth made of?

828

---

What is the difference between a canyon, gorge, and valley?

775

---

What does a geologist do on a typical day?

959

---

What is the name of the largest volcano in the world?

795

---

What is the difference between the geoid and the surface of the earth?

772

---

Soils take how many years to form?

879

---

What is the difference between a semi-precious and a precious stone?

764

---

What are examples of techno fossils?

988

---

Discuss major factors that influence mass movements?

737

---

What did radon detection in arid areas can help to explore?

729

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