Which items exist on earth because of green plants ?

From the following items:

1. An atmosphere containing oxygen

2. wooden furniture

3.food, including vegetables, fruits, and meats

4.fibers to make cloth

5. drugs such as aspirin

6. fossil fuels such as oil, gas, coal and nutrient-rich soil

ALL of these things are one way or another, exist because of green plans. E.g. Oxygen is released by plans, while wood for furniture comes from trees.

All fruits and vegetables are grown on plans while even meat comes from animals who eat green plans.

Fibres such as wool also come from animals which eat plans, and fossil fuel is made from the remains from millions of years of old plans in the ground.

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relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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