But around the time of the rise of plant life, the content of those sediment layers began to change. The coarse grains became much finer, and we see evidence of mud. This suggests that plants promoted the preservation of mud when they sent their roots into the ground. ...
Narrator: Listen to part of a lecture in a geology class.MALE PROFESSOR: As geologists, we examine layers of sediment on the Earth's surface to approximate the dates of past geologic time periods.Uh, sediment, as you know, is material like sand, gravel ⋯ fossil fragments ⋯ that is ...
of these materials, while the lower levels get enriched with them.And that creates distinct layers of soil as far down as the rock underlying the soil.And the materials that dissolve easily in water can get lost completely if the water carries them horizontally out of the soil and into ...
Water carries the more mobile materials from the upper level of soil to the lower levels. So the upper levels of the soil eventually get depleted of these materials, while the lower levels get enriched with them. And that creates distinct layers of soil as far down as the rock underlying ...
1961Mouton Rothschild– Still dark in color, the impossible to forget aromatics were filled with Asian spice, truffle, cigar box, cedar wood, fresh strawberry jam, incense, coffee and mint. Packed with layers of sweet, rich, intense, pure, exotic spices and fruit, with plush, opulent...
But around the time of the rise of plant life, the content of those sediment layers began to change.The coarse grains became much finer,and we see evidence of mud.This suggests that plants promoted the preservation of mud when they sent their roots into the ground.The roots helped to reinf...
So what caused the monsoon to migrate?Well, the answer is the dynamics of Earth's motions--the same thing that caused the Ice Age, by the way. [slowly, wanting every word to sink in]The Earth's not always the same distance from the Sun. And it's not always tilting toward the Sun...
Does anyone know how the gas separates, ah, from the oil? Sam, go ahead. MALE STUDENT: Doesn't it happen when the oil shoots up to the surface? MALE PROFESSOR: Yes. That’s right. When oil reaches the surface of the earth, there's less pressure on it, and with less pressure, ...
Dissatisfaction with conventional explanations for dinosaur extinctions led to a surprising observation that, in turn, has suggested a new hypothesis.Many plants and animals disappear abruptly from the fossil record as one moves from layers of rock documenting the end of the Cretaceous up into rocks ...
The fast-flowing water on the outside of the bend digs out material from the riverbank and pushes this material laterally across the bottom, and it gets deposited on the other side of the river, on the inner side of the bend. So when we see in the sediment layers evidence of lateral ...