Abstinence is the only guaranteed way to avoid pregnancy.
Answer:
results in many diffuse wources in contrast to point sources where they are identifiable
Slate, Skarn, Marble, and Quartzite are Metamorphic Rocks.
BUT SKARN is the type of rock that does not belong in the same category as the others.
Slate metamorphosed from mudstone. Marble metamorphosed from limestone. Quartzite metamorphosed from sandstone. All these rocks retain their solid forms.
Skarn<span> is a metasomatic rock composed of calc-silicate minerals.
Skarn is formed at the contact zone between carbonate rocks and silicic
magma. Skarn is often rich in hydrothermal ore minerals.</span> Skarn as a metamorphic rock is dissolved under metasomatic process and hardens back into a rock.
Let's see... radiation can cause mutation...that's all i can think of at the moment, sorry
Global warming and Global cooling. As the Earth's orbit becomes more elliptical, (as it is now,) it begins a Global warming and enters into an Interglacial period, when the Earth is mostly warm. When the Earth's orbit becomes more circular around the sun, (as it has been at least two or three times before so far,) it begins a Global cooling and enters into a Glacial period. I hope that this helps!