History Of Life

Question 1

Relative dating

Answer 1

Working out how the rock layers at the bottom of the one being worked on are older

Question 2

Paleomagnetic dating

Answer 2

Using the earth’s magnetic poles to see the tempo at which the magnetic poles are

Question 3

Dendrochronical comparisons

Answer 3

Age of trees
Determined by annual rings
Cannot date anything before Stone Age

Question 4

Radiometric dating

Answer 4

Direct method
temp of radioactive decay
Not affected by climate

Question 5

Cambric explosion

Answer 5

When major multicellular animals started to appear as fossils

Question 6

Fossil definition

Answer 6

Remained of organisms that lived long ago and were conserved

Question 7

Body fossil

Answer 7

Fossilisation of organisms or body parts

Question 8

Form fossils

Answer 8

Form when sediment hardens around an organism

Question 9

Mould fossil

Answer 9

When a cavity is filled with hardened minerals

Question 10

Unchanged fossils

Answer 10

Frozen or in amber resin mummified
Perfectly preserved

Question 11

Why 99% of species went extinct

Answer 11

Didn’t adapt to environmental changes
Could not keep up with fast changing environment
Developed into new species

Question 12

Mass extinction

Answer 12

When massive numbers of species die simultaneously