How do the time scales of nature and geology coincide? How has Earth changed over geologic time? How were tectonic plates moving in the Triassic Period? How many sections of time make up geologic time? How much of Earth's history is included in Precambrian time?
Dinosaurs lived for about 170 million years, and during that time, the continents gradually spread to form the shapes we recognize today. (Thanks, plate tectonics!) Dinosaurs continued to live on every continent; there are even fossils buried under the ice in Antarctica. Dinosaur Appearance: Skin...
How has the Namib Desert changed over time? What is the Sahara desert biome? What amount of precipitation do cold deserts get? How are valleys formed by plate tectonics? Where are the temperate desert biomes located? What causes the rain shadow for the Atacama Desert?
Venus, which is only slightly smaller than Earth, may still have volcanic activity today, and its surface seems to have been resurfaced with lavas as recently as half a billion years ago. Today it has no discernable plate tectonics system; its volcanoes were likely powered by thermal plumes r...
Wikelski has a hypothesis about this phenomenon: “My take on the whole thing would be that it could be something that’s airborne, and the only thing that I can think of is really the ionized [electrically charged] particles in the air.” ...
Mars is currently in the Amazonian period, and it has been for nearly 3 billion years. The fact that the Amazonian has been going on for so long is indicative of the fact that Mars is very geologically inactive and hasn't changed much for billions of years. ...
Despite how dry Mars is, it actually has a lot of water; it's all just frozen underground or at the north pole. Research indicates that Martian ice might be hiding some exciting secrets, but scientists also estimate that if all of the planet's ice were melted and spread evenly over ...
Venus, which is only slightly smaller than Earth, may still havevolcanic activity today, and its surface seems to have been resurfaced with lavas as recently as half a billion years ago. Today it has no discernable plate tectonics system; its volcanoes were likely powered by thermal plumes ris...
These often occur where plate movement has caused large fractures in the earth's crust, and may also spring up around the base of a volcano with a central vent. Fissure eruptions are characterized by a curtain of fire, a curtain of lava spewing out to a small height above the ground. ...
2\. Choose an element to begin with. It is usually a good idea to begin with the element that has the most atoms. In this case that is the 12 hydrogen atoms in the product side. The reactant side must be changed so that there are 12 hydrogen atoms on that side as well. To do ...