B, C, and D.
Solar energy is green energy, it wouldn't contribute to global warming. However some places of the world don't receive as much sunlight (the poles) and at night you don't receive as much sunlight either. Solar energy is also very expensive to farm.
Answer: A literature review consists of an overview, a summary, and an evaluation (“critique”) of the current state of knowledge about a specific area of research.
Explanation:
I think it’s a because it the only reasonable answer
Explanation:
the speed of sound depends on the particles of the medium of the sound wave is moving through because the particles in the solid and tightly packed together South Wales weekly transfers energy from particle to particle in a solid
I assume that you want to find out what's the frequency is.
Number of oscillation = 6 which being done in 30 second.
which means the time period for 1 oscillation is 30 second/6 = 5 second
Frequency = 1/time period
= 1/5 Hertz
Hope this help
