Geophysics

magnetic compass

Triangulation for accuracy.

The method is called "triangulation" ... same method used by GPS units to coordinate the exact locations.

Please see the related question for more information.

On the drum of a seismic recorder, the pen moves up or down according to the earthquake waves reaching it, giving a 2D record.

California and Alaska share the North American plate. But a bit of California, that is, a slice of it cut into the state near San Francisco and going south to the Gulf of Mexico, is on the Pacific plate. That bit of what is currently the California coastline, including the islands offshore in what is now Southern California are headed toward Alaska. It might be more accurate to say that the North American plate is moving south. Whether that bit of California will still be above the surface when they get there, we don't know. But there's a catch. (There's always a catch.) The Pacific plate is moving under the North American plate. What this means is that as those little bits of California move north (or the North American plate is moving south), they are also moving east and under the North American plate. That's because there is a big split down the middle of the Pacific plate (called the Pacific rift zone) that is pushing some of the Pacific plate east. There is a subduction zone which is offshore and runs along the western U.S. from northern California up past Oregon, Washington and along a bit of British Columbia. The end result is that there may not be any bits of California left above water by the time that portion of the Pacific plate reaches the Alaska area. But let's do the math (which is all we can do since we don't have a crystal ball). The plates are moving at a relative speed of about 5 centimeters per year (5cm/yr), so let's assume it stays constant. There are some 1200 kilometers (1200 km) between California where the fault comes ashore and the souther tip of Alaska (ball park figure). In case you don't have a calculator handy or can work it in your head, it's gonna take about 24 million years for California to get to Alaska, give or take a few. You just gotta wonder what the earth is gonna look like that long from now! If you look below, there is a smokin' link (SciLink) to a post that has lots of killer information and super illustrations. You read that and you'll become an expert in plate tectonics overnight! Go read it. Dare ya!

Its a company in India that collects and interprets data related to the earth's surface and the soils and rocks beneath and provides advice, for purposes related to the oil and gas industry, the mining industry and the construction industry.

zone 2A

This is an interesting question! We've notified our experts in this category and we'll email you when there is a response.

the humidity is very high..close to 100%

The Europeans.

Because in desert is where factors that contribute to mass wasting are commonly found.eg powerfull winds, physicals weathering etc

If you are asking about tributaries... the first river that flows into the Mississippi north of St Louis is the Missouri, but the Missouri is not really considered to be a tributary. It's a major river unto itself. Further north, the Illinois River flows into the Mississippi.

The Haitian earthquake rates as along with the Sumatran earthquake and tsunami as the most terrible earthquake since 1975. Tangshan, Kashmir, and Sichuan round out the top five.

Igneous rocks are formed around hot spots when there is an increase in temperature, a decrease in pressure, or a change in composition. Igneous rock is formed through the cooling and solidification of magma or lava.

thinner and denser

The plate tectonic theory states that Earth's lithosphere is divided into several large, rigid plates that move and interact with each other at their boundaries. These interactions result in processes such as earthquakes, volcanic eruptions, and mountain formation. The theory provides a comprehensive explanation for many geological phenomena and continues to be a fundamental concept in understanding the Earth's dynamic nature.

When magma with a large amount of dissolved gases reaches the Earth's surface, the gases expand rapidly, causing pressure to build up. This can lead to explosive volcanic eruptions as the built-up pressure is released violently, ejecting magma, gases, and volcanic ash into the air.

In a story I'm creating, many "elements" are manipulated by certain people. I've included life, death, wind, earth, light, darkness, fire, and water. Any ideas to what the other two could be? Anything will do for I should be able to work with them. (Sorry if the subject is a bit off)

The most dominant mineral on Earth is silicate minerals, which make up the majority of the Earth's crust. Quartz is one of the most common silicate minerals found in the Earth's crust.

I'm no expert, but I know that south America and Africa can fit together well and their mountain ranges are similar, meaning they could have split. Also, the himilayas were formed when India smashed into Asia, causing mountains to rise. Hope that helps.

volcanoe

there are 7 huge plates but dozens of smaller plates

Fossil evidence of the same species found on different continents and rock formations that match up across different continents are two pieces of evidence for continental drift. These support the theory that continents were once connected and have since moved apart.

it is a wave of Devansh

Earthquakes move through the ground in waves, much like how thunder does through air.

This question has a very complex answer and you would do best to look at a chart, in order to have a full grasp of the answer. There are several categories and subcategories, so the answer can vary, depending on the depth of the answer being sought and the setup of the chart you are using. Because of this fact, if you are learning this subject in school, and seeking to answer your teacher's / professor's question, then you might want to check your book for a chart first.

To answer your question though, the categories are as follows:

Phaneritic, which means it contains coarse grains / visible crystals. Within the phaneritic category, there is a subcategory which contains larger crystals, called pegmatitic, (but they are still phaneritic too).

Porphyritic, which means it contains a mixture of coarse and fine grains, to put it simply. (To put it less simply, it is fine-grained and contains appreciable phenocrysts.)

Aphanitic, which means it is fine-grained.

Glassy, which looks like glass. (Think of obsidian.)

Vesicular, which contains gas holes, made from gas bubbles. (Think of pumice.) But depending on the chart, this category may or may not fall under glassy, since pumice, for example is actually made of frothy glass. Futhermore, some types of vesicular rocks may be subdivided into a category called frothy.

Pyroclastic, which is made up of fragmented volcanic debris. (However, this category may be divided depending on fragment size. The subcategories are volcanic tuff, (which has fragments under 2 mm in size), and volcanic breccia, (which has fragments over 2 mm in size).

Again, the answers sought can depend on the depth of knowledge being sought. For example, if you are seeking this answer for a school assignment, your teacher or professor might only be seeking phaneritic, aphanitic, porphyritic, glassy, and pyroclastic. However, they may want to see the subcategories of pegmatitic, frothy, vesicular, volcanic tuff and volcanic breccia. The answers can be more in depth too, but I hope this is enough to help you. Again, I recommend looking at any handouts or your book, if you are a student, in order to ascertain just what depth of knowledge your teacher / professor expects you to have.

yor mom