Classify the statements as true or false. fossils scientists date rocks. sometimes younger rock layers are found beneath older rock layers. no fossils from the precambrian era have been found because there were no organisms at that time. the map of earth has changed over millions of years, but it is now set.

Fossils help scientists date rocks: True

Sometimes younger rock layers are found beneath older rock layers: True, because it happens with landslides and other causes.

No fossils from the Precambrian era have been found because there were no organisms at the time: False because there were organisims like algae and bacteria, and there are a very small amout of fossils from that era.

The map of Earth has changed over millions of years, but is now set: False

1. True 2. True 3. False 4. False

Explanation:

Fossils help scientist date rocks: Fossil presence is one of the most useful characteristics to date a rock, a fossil will set a specific geological age in which the organisms was present in the world, and vice-versa a new fossil can be dated by studying the age of the rock it was found.

True

Sometimes younger rock layers are found beneath older rock layers: This phenomenon can be found in rock layers near the surface because process such as landslides that happen on the surface moves the surface rocks often resulting in older rocks appearing in the surface and younger rocks being buried by them.

True

No fossils from the Precambrian era have been found because there were no organisms at that time: Although the number of organisms where very little organisms like algae (Stromatolites) were present in this era and fossils can be found.

False

The map of Earth has changed over millions of years: but it is now set: The Earth crust is actually still moving, and will always move due to the tectonic plates and their movement caused by density and pressure, Nowadays The countries have moved from their once mapped location, because of this maps are needed to be updated by new geodesic measurements of the surface. Earth crust moves 2.5 centimeters per year.

False

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