Earth's Second Atmosphere The second atmosphere, which was the first to stay with the planet, formed from volcanic outgassing and comet ices. This atmosphere had lots of water vapor, carbon dioxide, nitrogen, and methane but almost no oxygen.
Answer:
Movement in the mantle caused by variations in heat from the core, cause the plates to shift, which can cause earthquakes and volcanic eruptions.
Mountain chains and river systems generally run North-South throughout the continent thus making for formidable barriers to East-West expansion.
A line has one dimension, length.
A plane consists of an infinite set of lines.
No there equally the same
