Answer:
Terrestrial Planet
Explanation:
Mercury, Venus, Earth, & Mars are terrestrial plants.
Answer:Resources such as rocks, soil, water, and air, nonliving things that help to meet our needs. This lesson focuses on students learning about Earth's Resources. They learn that water and air are renewable resources that can be replaced quickly. They learn that soil and rocks are non-renewable and they cannot be replaced quickly.
Explanation:
A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
Learn more about radioactive decay brainly.com/question/9796067
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A lake community with four trophic levels suddenly suffers from algal blooms. Using the strategy of biomanipulation, an ecologist may propose removing zoonplankton.
Hope I helped.
