2. It is the study of rock layers and layering.

3. It is a remnant or trace of organisms of a past geologic age.

4. He is an English engineer and canal builder who discovered that each rock formation in the canal he worked on contained fossils.

5. Associated with a particular span of geologic time.

6. It was considered the “chaotic eon” and stretched from about 4.6 to 3.8 BYA.

7. It was the time of great changes: oxygenation of the atmosphere, origin and diversification of eukaryote life, appearance of multicellular animal life, and the motion of continental drift.

8. The first animal to succeed in adapting itself to breathe air during the Paleozoic era.

9. The first true terrestrial vertebrates existed which flourished during the Mesozoic era.

10. He is a seismologist who discovered in 1936 that Earth has a solid inner core and his studies showed that the hot spherical solid has a radius of 1250 kilometers.

11.He led the team from the University of the Philippines which found a 67 000 year-old foot bone in Callao Cave in Cagayan Province and lead to the discovery of Tabon man.

12. A technique which is based on the decay rate of certain radioactive isotopes within fossils, rocks, and artifacts.

13. It is attributed to the dynamo effect of circulating electric current.

14. It is the intermediate layer of Earth which is made up of molten rocks called magma.

15. It is 2240 km thick and is detected between Earth’s lower mantle and the outer core as observed by changes in the seismic waves.

16. The British Geologist who coined the name asthenosphere which is the layer that lies after the lithosphere.

17. It refers to the proportion of dissolved salts to pure water, expressed in parts per thousand.

18. It studies the life that existed prior to, or sometimes at the start of, the Holocene epoch.

19. The scientist who is responsible for the unearthing of Tabon Fossil.

20. A period were there was a profusion of volcanoes, the sky was orange due to abundance of methane, the sea was green because of iron, and shorelines were marked with stromatolites.

21. It states that fossil organisms succeed one another in a definite and determinable order and, therefore, any time period can be recognized by its fossil content.

22. The impressions on rocks that showed various activities.

23. It stated that geologic features like faults or igneous intrusions are younger than the rocks they cut across.

24. The hollow impressions of a living thing in a rock.

25. The layer of the atmosphere with decreasing temperature as altitude increases and is considered as the coldest region in the atmosphere.

26. The layer of the ionosphere that reflects radio waves.

27. The border between tectonic plates.

28. The upper boundary that separates the upper mantle from Earth’s crust and is defined by the sudden increase in seismic velocity.

29. The process in which volcanic eruptions, large quantities of water and gases are emitted to Earth’s surface.

30.One of the major sources of salts in the ocean

31. The region in which the sea bottom is exposed during low tide and is covered during high tide.

32. Common animals found in this zone include seals, sea turtles, sea lions, rays, and sharks.

33. The coldest of all the biomes and has low biotic diversity and simple vegetation structure.

34. A type of organism called which evolved and began carrying out photosynthesis

35. The era which saw the formation of several continents.

36. It is characterized by low rainfall and have specialized vegetation as well as specialized animals that can adapt to its condition.

37. The region which houses numerous species of plants and animals.

38.The deepest part of the ocean.

39. Most animals living in this area are invertebrates like blind shrimps, small squids, and hagfish.

40. Any deviation from horizontality indicates that deformation occurs after the deposition.

II. TRUE or FALSE

41. Geologists also make use of information derived from fossils to define and identify subdivisions of geologic time scale.

42. Continent formation began during the Archean period.

43. If you look into the time span in geologic timeline, Precambrian comprises about 88% or a total span of roughly 4.1 billion years

44.Most meteoroids that enter the atmosphere burn up due to the intense friction that builds up between the air and the meteoroid.

45. Dinosaurs were believed to be descendants of the primitive reptiles that had survived from the Paleozoic era.

46.The ionosphere lacks the weather-producing air turbulence and is almost completely free of clouds and other forms of weather.

47. Ozone absorbs the ultraviolet rays from the sun and releases some of this energy in the stratosphere.

48. By the middle of the Mesozoic era, marine life forms had developed shells.

49. Burning meteoroid is seen on Earth as “shooting star” or “burning meteors.”

50. Biomes are the world’s major communities.