Answer:
How would we know this unless we are some Historical genius that knows everything about this subject. Give me a passage to read about this.
Explanation:
B. Sometimes dirt will build up over millions of years and then there is a big flood and it all washes away. This creates a time Gap in the layers for those millions of years the dirt was there
Answer: The primary two methods by which planet are found around other stars are:
I) Direct images in visible and infrared light.
Explanation: This is viewing the star by seeing itself. This method is very tedious and difficult because of the light made up by the extrasolar planets around the galaxy.
Look up for example The rain forest and the desert then tell how they are different
Uses of fossil fuels,deforestation,livestock farming,chemical fertilisers,ovens currents,orbital changes,wind/air masses,energy use and oil/gas drilling.
There are many more,believe me you nerd