It erupted in 1970, 1980, 1981, 1991, and the most recent eruption occurred in 2000 and lasted for 12 days. The volcano has been around for 7000 years and has been blowing up randomly ever since. Apparently about 2800 years ago, Mount Hekla had its largest eruption, and traces of the blast have been found as far as Scandinavia. Mount Katla is located in the most southern portion of Iceland, which is a mountain recently known for causing flooding when it melted glaciers on top of it. Due to all of Iceland’s volcanic activity, there is also a great deal of glacial activity.
It increased by 7 ft a day.” Earthquakes You can predict when a volcano will erupt because you get earthquakes. This is because most volcanoes follow a regular pattern of increasing seismic activity as the eruption is about to take place, usually in the form of small earthquakes. Scientist use special equipment seismometers that tell and record earthquakes that happen underneath the volcano. Long period earthquakes- are beneath volcanoes and are believed that it is caused by magma moving through cracks that then shake the ground. Short period earthquakes- earthquakes under the volcanoes that is believed to be caused by rock breaking events Both types of
is quite late in the history of the Universe, which -- as we told you in our lastInstruction -- is thought to have begun about 15 million years ago with an almostunimaginable explosion called The Big Bang.At first, the Earth was just a ball of molten rock and gasses. As it began to cool,dense materials like iron sank down into its core. Lighter materials likecompounds of oxygen and water rose toward the surface.That's why the Earth is made up of different layers -- as you can see in this crosssection:There are three layers in the Earth: the Crust, the Mantle and the Core. For another way to look at them, click:http://mediatheek.thinkquest.nl/~ll125/en/fullstruct.htm -------------------------------------------------------------------------------- Page 2 www.etap.orgEarth Science Lesson 3Dynamic Earth Processes (Grades 8-12 )Instruction 3-1The Internal Structure of the Earth2 of 2California Content Standards Earth Science 3.b.B. J. Subbiondo © 2004The CrustThe outer layer of the Earth is called the crust.
It created a lot of homes for the animals that are living in the park and became big attractions for visitors all around the world. The volcano in Yosemite Park erupted and the lava cause to make igneous rocks because of the cooling and solidification of the lava. Also the lava formed other rocks like granite and tonality are all form of plutonic rock, but also referred to as granitic rocks (Yosemite National Park). Plutonic rocks are compress with five minerals (Yosemite National Park). The plutonic rocks were formed by magma and are form deep within the Earth.
These volcanoes are caused by tectonic plates that make up part of the earths surface. Both of these countries are near the gaps, where magma can seep through, causing a volcano. These tectonic plates can cau`se earthquakes as well. Japan is located at the junction of 4 tectonic plates - the Pacific, Philippine, Eurasian and North American plates, making Japan the place that is known for earthquakes. Both Japan as well as Italy have water surrounding them either on most or all sides.
Being the largest volcano on Earth, Mauna Loa is 4 km above sea level, its mass 8 km added to the long submarine planks that dig into the sea floor another 5 km. This gigantic volcano takes up half the island of Hawaii, the summit in 17 km (56,000 ft) above its base. The volcano adds to 85 percent of the other islands combined. Being one of Earth’s most frequent erupting volcanoes, erupting thirty three times since its first ever documentation in 1843. The last eruption happened in 1984, and we’re certain the volcano will erupt again, but for now we monitor Mauna Loa for any indication of its next eruption.
When most people today picture a volcano, they have the same stereotypical view of what it looks like, and what it does. They probably imagine a funnel shaped landform where lava comes exploding out from the top. While this is a fairly accurate portrayal of a volcano, many people don’t know that there are actually several different ways in which volcanoes can be categorized. Based on a volcano’s shape, size, eruption type, and location, it is considered a member of three different volcano types. There are shield volcanoes, composite volcanoes, and cinder cone volcanoes.
He believed that all of the continents were once joined together, forming a super-continent called Pangaea. These plates are thought to float on the underlying semi-molten asthenosphere and are moved by convection currents that derive their heat from the earth's crust. It states that this process isi continous and forms new land along the boundaries where the plates move apart - known as constructive margins - and destroys older crust where the plates are moving together - destructive margins. Later evidence also supported this theory - fossilised remains of a dinosaur, the mesosaurus, were discovered on the coasts of Brazil and Gabon. Wegeners ideas were proved even further, increasing our knowledge of tectonic events.
All igneous rocks are made from magma. Sedimentary rocks go through many processes. They include weathering, deposition, erosion, lithification, and compaction. Twelve common sedimentary rocks are conglomerate, breccia, sandstone, siltstone, shale, limestone, dolomite, gypsum, salt, chert, coal, and amber. They are all made from pieces of different rocks.
Meteorites are heavy. Most meteorites are much denser than ordinary Earth rocks. The unusual weight is due to high iron content. Even stone meteorites will feel heavier in the hand than most Earth rocks. Meteorites likely traveled in space for millions of years before visiting us here on Earth.