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Earth Science Facts

A ____ is an elongated whale-shaped hill formed by a glacier. contour
A ____ line (isoline) joins points of equal elevation (height). core
A molecule of ____ contains three oxygen atoms. drumlin
The Earth's atmosphere is mostly ____ and oxygen (O2) gasses. ebb
The tide stages are flood tide, high tide, ____ tide, and low tide. mantle
About 66 million years ago, a massive ____ hit the Earth. meteorite
The Earth's ____ is mostly solid rock between its crust and core. nitrogen
The Earth's ____ is composed of hot iron and nickel. ozone