Answer:
1.rock gets destroyed
2.rock get stuck under sailers shoe
3.sailer walks on land
4. sees rock under shoe
5. he takes of rock from shoe and throws it away
6. millions of years later you step on that same grabit
Explanation:
It is estimated that 100 million animals die every year due to water pollution.
In addition, ocean pollution affects 1,000 species of marine animals. However, these are rough estimates because it is almost impossible to calculate the exact number of animals killed by water pollution. Polluted water can pose a serious threat to both animals and humans. Animals and plants living in this water often die from this pollution.
Even if a particular animal did not die from pollution, it would likely die from changes in the food chain. Animals and people who drink water from this source can contract bacteria and diseases that are often carried in this water.
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Answer: They live in moist environments and have xylem.
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
Answer:
A
Explanation:
Beacause if we lived too close to sun we be burnt
