The core of the earth is also known as ______
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The study of mountains is known as
Soil contains decayed remains of living organisms. This is called __________.
Classes comprising animals like fishes, amphibians, reptiles, birds along with mammals constitute the category called?
"Sirius", the brightest star outside solar system, is also called ______.
Wheat is a ______.
A wide inlet of the sea usually concave in shape, is termed as a:
Thunder Cloud happens in which layer of the atmosphere?