Earth Quotes

The weight of the earth lingers in these words—both its quiet, unshakable presence and the way it hums with unseen forces, from the slow turn of seasons to the sudden crack of a storm. Here, the planet speaks through poets, scientists, and dreamers, revealing its beauty, its fragility, and the strange, intimate bond between human hands and its soil.

7,555 QUOTES — PAGE 144 OF 378

“Push up some mountains. Cut them down. Drown the land under the sea. Push up some more mountains. Cut them down. Push up a third set of mountains, and let the river cut through them. “Unconformity” is the geologic term for an old, eroded land surface buried under younger rock layers. Put your outspread hand over the Carlin Canyon, Nevada unconformity and your fingers span roughly forty million years- the time that it took to bevel down the first set of mountains and deposit the younger layers on top. What is forty million years? Enough time for a small predatory dinosaur to evolve into a bird. Enough time for a four-legged, deer-like mammal to evolve into a whale. And far more than enough time to turn an ape-like creature in eastern Africa into a big-brained biped who can marvel at such things. The Grand Canyon’s Great Unconformity divides 1.7 billion-year-old rock from 550 million-year-old rock, a gap of more than one billion years. One billion years. I earn my salary studying the Earth and teaching its history, but I admit utter helplessness in comprehending such a span. A billion pages like those of this book would stack up more than forty miles. I had lived one bullion seconds a few days before my thirty-second birthday. A tape measure one billion inches long would stretch two-thirds of the way around the Earth. Such analogies hint at what deep time means- but they don’t get us there. “The human mind may not have evolved enough to be able to comprehend deep time," John McPhee once observed, “it may only be able to measure it.”

Keith Meldahl

“A newly formed planet appeared on the large screen. its surface was till red-hot, like a piece of charcoal fresh out of the furnace. Time passed at the rate of geological eras, and the planet gradually cooled. The color and patterns on the surface slowly shifted in a hypnotic manner. A few minutes later, an orange planet appeared on the screen, indicating the end of the simulation run."The computations were done at the coarsest level; to do it with more precision would require over a month." Green Glasses moved the mouse and zoomed in on the surface of the planet. The view swept over a broad desert, over a cluster of strangely shaped, towering mountain peaks, over a circular depression like an impact crater."What are we looking at?" Yang Dong asked."Earth. Without life, this is what the surface of the planet would look like now.""But . . . where are the oceans?""There are no oceans. No rivers either. The entire surface is dry.""Your'e saying that without life, liquid water would not exist on Earth?""The reality would probably be even more shocking. Remember, this is only a coarse simulation, but at least you can see how much of an impact life had in the present state of the Earth.""But--""Do you think life is nothing but a fragile, thin, soft shell clinging to the surface of this planet?""Isn't it?""Only if you neglect the power of time. If a colony of ants continue to move clods the size of grains of rice, they could remove all of Mount Tai in a billion years. As long as you give it enough time, life is stronger than metal and stone, more powerful than typhoons and volcanoes.”

Liu Cixin