Identify a specific scientific concept or phenomenon for which our understanding has changed over time (e. g., the nature and structure of the atom, genetics, plate tectonics, evolution, the solar system, big bang, biogeography).

What came first egg or chicken? and is tomato a vegetable or a fruit?

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.