Foliation develops in metamorphic rocks when
What will be an ideal response?
rocks of the correct chemical composition are metamorphosed in a compressive setting
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The universe is dominated by dark ________
Fill in the blank(s) with correct word
What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. B) The atmosphere is too cold and thin for abundant liquid water today, yet we see evidence of large areas of flowing water in the past. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tells us that Mars must once have been much warmer.
When we say energy levels in an atom are discrete, we mean that their energy levels are well defined and
A) separate from one another. B) separated by equal energy increments. C) continuous. D) private.
Which of these strongly relate to a piano string?
A) mass B) length C) pitch D) all of the above E) none of the above