Geosciences
A naturally occurring injection of underground fluids drove a four-year-long earthquake swarm near Cahuilla, California, according to a new seismological study that utilizes advances in earthquake monitoring with a machine-learning … Read More
Major earthquakes — magnitude 8.5 and stronger — occur where faults are mostly flat, say University of Oregon and French geologists. Curvier faults, they report in the journal Science, are … Read More
Ripple marks are sedimentary structures and indicate agitation by water (current or waves) or wind. Ripple marks are ridges of sediment that form in response to wind blowing along a … Read More
Masses of rock do not weather uniformly. Take a moment to look back at the photo of Shiprock, New Mexico, in Figure 1. The durable volcanic neck protrudes high above … Read More
Identify and describe the six major igneous textures. The term igneous exture is used to describe the overall appearance of a rock based on the size, shape, and arrangement of … Read More
Explain how rocks of similar age that are in different places can be matched up. To develop a geologic time scale that is applicable to the entire Earth, rocks of … Read More
Figure 1 shows layers of rock that have been offset by a fault, a fracture in rock along which displacement occurs. It is clear that the strata must be older … Read More
Although convection in the mantle has yet to be fully understood, researchers generally agree on the following: Convective flow in the rocky 2900-kilometer- (1800 mile-) thick mantle—in which warm, buoyant … Read More
Figure 1 is a drawing of three core boxes to illustrate some of the points made above.The drawing Fig. 1 is two dimensional and limited in what it shows by … Read More
