How old is the sun, approximately?

2. How old is the sun, approximately? 5 million years old 10 million years old 5 billion years old 10 billion years old 13 billion years old

3. How old is the sun, approximately? 5 million years old 10 million years old 5 billion years old 10 billion years old 13 billion years old

4. Scientists classify particles in the solar system by By diameter and temperature By speed of entry and mass By diameter and speed of entry By composition and diameter By mass and composition

5. Scientists classify particles in the solar system by By diameter and temperature By speed of entry and mass By diameter and speed of entry By composition and diameter By mass and composition

7. The figure shows what type of particle from the solar system? Asteroid Comet Meteorite Meteor Meteoroid

8. The figure shows what type of particle from the solar system? Asteroid Comet Meteorite Meteor Meteoroid

9. A particle from the solar system that strikes the Earth is called a Asteroid Comet Meteorite Meteor Meteoroid

10. A particle from the solar system that strikes the Earth is called a Asteroid Comet Meteorite Meteor Meteoroid

11. What is the significance of the Tunguska River Valley in Siberia in terms of asteroids? Site of enormous wildfires in prehistoric times caused by an asteroid. Site of the largest impact crater ever recorded on Earth. Largest meteorite was sighted. Location of crater that marks the asteroid that killed the dinosaurs. Large airburst of an asteroid occurred in recent history.

12. What is the significance of the Tunguska River Valley in Siberia in terms of asteroids? Site of enormous wildfires in prehistoric times caused by an asteroid. Site of the largest impact crater ever recorded on Earth. Largest meteorite was sighted. Location of crater that marks the asteroid that killed the dinosaurs. Large airburst of an asteroid occurred in recent history.

13. The figure shows an example of what type of crater? Rebound Simple This is not a crater Complex impact Soft impact

14. The figure shows an example of what type of crater? Rebound Simple This is not a crater Complex impact Soft impact

15. Which is not a reason craters are more common on the moon than the Earth? Ocean impact sites have been buried by marine sediment. Very few meteoroids enter Earth’s atmosphere. Ocean impact sites have been destroyed by plate tectonic processes. Land impact craters have eroded. Smaller meteoroids tend to disintegrate in Earth’s atmosphere.

16. Which is not a reason craters are more common on the moon than the Earth? Ocean impact sites have been buried by marine sediment. Very few meteoroids enter Earth’s atmosphere. Ocean impact sites have been destroyed by plate tectonic processes. Land impact craters have eroded. Smaller meteoroids tend to disintegrate in Earth’s atmosphere.

17. Which concept is now used to explain the processes that form the Earth’s landscapes? Punctuated uniformitarianism Catastrophism Uniformitarianism None of these are used Gradualism

18. Which concept is now used to explain the processes that form the Earth’s landscapes? Punctuated uniformitarianism Catastrophism Uniformitarianism None of these are used Gradualism

19. How is mass extinction characterized? All of these are characteristics If there are any survivors How large the volcanic eruption is How much the climate changes within a period Sudden loss of large numbers of plants and animals relative to the number of new species being added

20. How is mass extinction characterized? All of these are characteristics If there are any survivors How large the volcanic eruption is How much the climate changes within a period Sudden loss of large numbers of plants and animals relative to the number of new species being added

21. Which has not been a cause of mass extinction? Movement of tectonic plates Asteroid impact Large basaltic eruption Flooding from tsunami Volcanic activity

22. Which has not been a cause of mass extinction? Movement of tectonic plates Asteroid impact Large basaltic eruption Flooding from tsunami Volcanic activity

23. Which of the following was not a result of the K-Pg Boundary mass extinction? About 70 percent of all land and marine genera died off Set the stage for the evolution of mammals Widespread wildfires were experienced everywhere Demise of swimming reptiles Demise of large dinosaurs on land

24. Which of the following was not a result of the K-Pg Boundary mass extinction? About 70 percent of all land and marine genera died off Set the stage for the evolution of mammals Widespread wildfires were experienced everywhere Demise of swimming reptiles Demise of large dinosaurs on land

25. The impact or airburst of an asteroid or comet is not a direct cause of tsunamis. mass wasting. wildfires. climate change. flooding.

26. The impact or airburst of an asteroid or comet is not a direct cause of tsunamis. mass wasting. wildfires. climate change. flooding.

27. Which has the most influence on the consequences of an airburst or direct impact? Population of the site of airburst or impact Size of the extraterrestrial object Probability that it will occur Time between impacts or airbursts None of these influence the consequences

28. Which has the most influence on the consequences of an airburst or direct impact? Population of the site of airburst or impact Size of the extraterrestrial object Probability that it will occur Time between impacts or airbursts None of these influence the consequences

29. What have scientists been doing to minimize the impact hazard? Developing weapons to destroy an extraterrestrial object larger than 1 km (~3300 ft) in diameter. Building bunkers to hold everyone in case of a large impact. They have been working on all of these. Identifying and categorizing nearby objects that may threaten Earth. Working to break up all extraterrestrial objects that are within a certain distance from Earth.

30. What have scientists been doing to minimize the impact hazard? Developing weapons to destroy an extraterrestrial object larger than 1 km (~3300 ft) in diameter. Building bunkers to hold everyone in case of a large impact. They have been working on all of these. Identifying and categorizing nearby objects that may threaten Earth. Working to break up all extraterrestrial objects that are within a certain distance from Earth.