Answer:
The answer is below
Explanation:
The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:
Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:
That is one-eight of Strontium 90 would be left after 87 years
Answer:
Explanation:
Producer: Plants, use sunlight for energy, creates their own energy
Consumer: Uses other living things for food, can’t create their own energy, we are consumers
Decomposers: Mushrooms and fungi, break down decaying plants or animals, their actions creates nutrients for the soil
A substance floats if it is less dense, or has less mass per unit volume, than other components in a mixture. For example, if you toss a handful of rocks into a bucket of water, the rocks, which are dense compared to the water, will sink. The water, which is less dense than the rocks, will float. Basically, the rocks push the water out of the way or displace it. For an object to be able to float, it has to displace a weight of fluid equal to its own weight.
Water reaches its maximum density at 4 C (40 F). As it cools further and freezes into ice, it actually becomes less dense. On the other hand, most substances are most dense in their solid (frozen) state than in their liquid state. Water is different because of hydrogen bonding.
<span>A meteor is visible only once because when the meteor enter into the earth’s atmosphere it gets burned up in the process. While the comet may be visible at regular intervals because it rotate in a fixed elliptical orbit around the sun therefore it will stay in its path and eventually will be seen again in the same spot.</span>
Answer:
algae
Explanation:
thousands of microbes including bacteria and phytoplankton are interacting to form the base of the food web of the entire ocean. algae are phytoplankton that takes in sunlight, nutrients, carbon dioxide, and water to produce oxygen and food for other organisms.