Fossils

Question 1

What are fossils

Answer 1

-the remains of organisms for thousands of years ago which are found in rocks

Question 2

What theory do fossils prove

Answer 2

Darwin’s theory of evolution

Question 3

How are fossils made

1. B… are buried and last a l… time
2. They are eventually replaced by m… as they d…, forming a r… like substance shaped like the original b…
3. the surrounding s… turn into r…, but the f… stays d… inside the rock
4. Fossils are formed when an o… is b… in a soft material like c…
5. The clay h… around it as it d… leaving a c… of itself
6. Things like f… can also be p… into these materials
7. In a… and tar p… there is no o… or moisture so decay … can’t s…
8. In g… it’s too c… for the decay microbes to work
9. Peat b… are too a… for decay m…

Answer 3

1. Bones are buried and last a long time
2. They are eventually replaced by minerals as they decay, forming a rock like substance shaped like the original bone
3. the surrounding sediments turn into rock, but the fossil stays distinct inside the rock
4. Fossils are formed when an organism is buried in a soft material like clay
5. The clay hardens around it as it decays leaving a cast of itself
6. Things like footprints can also be pressed into these materials
7. In amber and tar pits there is no oxygen or moisture so decay microbes can’t survive
8. In glaciers it’s too cold for the decay microbes to work
9. Peat bogs are too acidic for decay microbes

Question 4

Why do we not know that evolution is certain

-many early f… of life were soft b…, so fossil r… are incomplete
-f… formed m… of years ago have been d… by geological a… eg … plates colliding

Answer 4

-many early forms of life were soft bodied, so fossil record are incomplete
-fossils formed millions of years ago have been destroyed by geological activity eg tectonic plates colliding