Earth formed about years ago, and the oldest known living organisms date to years ago.
a. 4.6 billion years ago 3.5 billion years agob. 6,000 years ago 6,000 years agoc. 13.7 billion years ago 4.6 billion years agod. 3.9 million years ago 2.0 billion years ago

What is turgor pressure, what causes it, and what does it do for a plant?

Did you know that a blue wales tongue weighs more than an elephant?

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