Convection occurs in fluids (so both liquids and gases, as well as rheids) and is the concerted, collective movement of groups or aggregates of molecules within the above through advection or diffusion or both at the same time. Convection can never take place in solids and is only specific to fluids.
Answer: B
Explanation: B is showing how a farmer(Im going to assume) is giving treats/bigger meals to goats that are giving the most produce this choice reminded me of a dog getting treats if it does a good job.
Answer:
elements
Explanation:
Maps have several important elements, or features. These features are the tools the map uses to convey information.
The Earth's true shape is called: A Oblate Spheroid. It might just look like a regular circle, but it's not. It's actually a Oblate Spheroid.
I know this because I did some research online.
Hope I helped!
- Debbie
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.
