25. What depositional sequence would indicate a rise in sea level (transgression

Question

25. What depositional sequence would indicate a rise in sea level (transgression)? a. Mud overlain by sand b. Decreasing particle size with depth c. Increasing particle size with depth d. None of the above 26. Which of the following describes the inclination of the magnetic field at UNT? a. The inclination is nearly horizontal in Texas b. The inclination is> 60 degrees down from the horizontal c. The inclination is approximately 30 degrees up from the horizontal d. None of the above 27. What is the likely origin of shark's teeth found in the Sherman, Texas area? a. Remnants of shark species that existed in the Precambrian period b. Remnants of shark species that existed in the Cretaceous western interior seaway c. Remnants of shark species during a sea level regression from the North American Plate d. None of the above 28. Assume that a representative value of sea floor spreading is 5 cm/year. If the earth's magnetic field reverses on average every 0.4 million years, what is the average width of magnetic bands of reversed remnant magnetism perpendicular to mid-ocean ridges? a. 80 meters b. 200 meters c. 80 km d. 20 km 29. Which of the following statements about the magnetic field of the earth is true? a. The inclination is closer to the horizontal at the equator vs UNT b. The inclination at UNT is less than the inclination at the North Pole c. Inclination decreases with latitude in the northern hemisphere d. None of the above 30. During the past 400000 years, what has been the relationship between CO2 in the atmosphere and average earth temperature? a. CO2 in the atmosphere has been constant and temperatures have trended downward b. CO2 in the atmosphere has increased and temperatures have decreases c. Cyclic changes in atmosphere CO2 and temperature appear to be related d. None of the above

Explanation / Answer

25. B

26. D

27. B

28. D ( Rate of Spreading = distance the sea floor moved / length of time)

29. B. The value is +90 at North pole, -90 at South Pole, zero at Equator.

30. D (concentration of CO2 has been reached 400 parts per million and also the temperature have been increased)

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.