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The outermost layer of the lava flow will almost immediately cool and form a crust, but the interior of the lava flow can remain molten for a time, Chadwick said.

Greenland’s forbidding environment, at the outermost boundary of the European and North American world, have long made it one of the strangest places on earth.

Studying CMEs – massive fireballs that blow out of the Sun’s outermost corona layer – is one of the most important scientific objectives of India’s maiden solar mission.

The brain's functional properties arise from the varied cell types within its cortex, the outermost layer responsible for many complex mental tasks.

The difference between the speed of the fast and slow solar wind is thought to be due to the different areas of the Sun's corona, the outermost layer of its atmosphere, that they originate from.