4. What items are scientists looking at to find if warming and ice
ages are normal changes?

Evidence from ocean sediments, ice cores, tree rings, sedimentary rocks and coral reefs show that the current warming is occurring 10 times faster than it did in the past when Earth emerged from the ice ages, at a rate unprecedented in the last 1,300 years.

Explanation:

Hope it is helpful

1."lessen the worth of ."

2."increase the worth of."

3." beyond the worth of."

4."against the worth of ."

the answer is option c.

explanation:

recycled water alludes to the water that being utilized again after it already  used for farming purposes.   this kind of water frequently contains pharmaceutical gathering due to the compound compost that is utilized for the plants is consumed into the water.