Ancient evidence of Variations in the global temperature

Question 1

How is POLLEN a valuable tool for dating sediments & rocks?

Answer 1

-Highly resistant to decay
-Persist in sediments for long periods

Question 1

What is POLLEN? + Characteristics

Answer 1

The microscopic grains contain the male reproductive cells of a plant.

-Has existed on Earth since the late Devonian.

-Modern plants produce vast amounts of pollen.

-Due to their small size, they are widely distributed by wind.

Question 2

How are SEDIMENTARY ROCKS sources of climate evidence:

Answer 2

The weathering process that generates sediment and the agents of erosion that transport & deposit the sediment are a consequence of climate conditions.

Question 3

What do sedimentary rocks contain?

Answer 3

Structures that reflect the climates in which they form.

Question 4

Fossil communities provide what kind of data?

Answer 4

only provide GENERAL information indicating that climates were hot & dry, tropical or cold.

Question 5

Marine fossils indicate..

Answer 5

A change in climate due to a drop in sea level.

Question 6

What are MACROFOSSILS?

Answer 6

Fossils that can be examined without the aid or a microscope.

Question 7

O18 characteristics:

Answer 7

-HEAVIER
-Absorbed by hard tissues (shells, teeth)
-Sediments/fossils formed in oceans

Question 8

016 characteristics:

Answer 8

-LIGHTER
-Evaporates during glacial periods.
-(Ice Ages)