1. How ice cores and tree rings reveal conditions and changes in the environment?
2. Why do rock fossils form in sedimentary rock rather than in igneous rock?
3.What is similar about mold- and- cast fossils and petrified wood?
4. What can rock fossils and original remains show about Earth's past?
5. A rock contains a radioactive element with a half-life of 120 million years. Tests show that the element in the rock has gone through four half-lives. How old is the rock? Please show your calculation process and the right answer
ใครช่วยได้ช่วยเค้าหน่อยนะ มึนตึบแล้ว
ใครเก่งไบโอมบ้างช่วยเข้ามาหน่อยน้า (อินเตอ)
2. Why do rock fossils form in sedimentary rock rather than in igneous rock?
3.What is similar about mold- and- cast fossils and petrified wood?
4. What can rock fossils and original remains show about Earth's past?
5. A rock contains a radioactive element with a half-life of 120 million years. Tests show that the element in the rock has gone through four half-lives. How old is the rock? Please show your calculation process and the right answer
ใครช่วยได้ช่วยเค้าหน่อยนะ มึนตึบแล้ว