What are the differences between the foraminifera below and above the K T boundary?
GeologyDifferences scientists saw in the foraminifera found in rock layers above and below the K-T boundary. Below: foraminifera fossils were larger and more diverse. Above: most foraminifera fossils disappeared; surviving species were smaller. How do foraminifera found in rock layers above the K-T boundary compare to those in rock layers below? How do foraminifera found
Does quartzite look like marble?
GeologySuper White Quartzite durability is well-known. Super White is not popular only because of its modern looks but also because of its amazing durability. It is hard, resistant to heat and scratches, and water absorption. A wonderful thing about Super White is that it looks like marble but wears like granite. What is quartzite look
How are sinkholes different from Caverns?
GeologySinkholes are funnel-shaped holes in the ground, and caverns are large open spaces underground. Why do caverns and sinkholes form? Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns
Which of these is a mafic mineral?
GeologyA mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro. Which minerals are mafic? mafic rock, in geology, igneous rock that is
Quelle est l’origine du magma ?
GeologyLe magma est à l’origine de la formation des volcans. Cette roche en fusion, qui bouillonne dans le cratère, provient d’une fusion partielle du manteau de la Terre. Futura a rencontré Jacques-Marie Bardintzeff, docteur en volcanologie, qui raconte l’origine du magma.Sep 25, 2020 Où et comment se forme le magma ? Formation du magma Il
Why do glaciers form U shaped valleys instead of V shaped?
GeologyGlacial erosion causes the formation of U-shaped valleys, whereas V-shaped valleys are the result of carving by the rivers through their course. U-shaped valley walls are straighter than V-shaped valleys due to the non-bending glacier’s movement. Glaciers do not get influenced easily by rock hardness as are rivers.Dec 21, 2021 Do glaciers create U or
What is the difference between Aphanitic and Phaneritic texture?
GeologyThe main difference between Aphanitic and Phaneritic is that the aphanitic rocks are very finely grained and their crystals cannot be seen with the naked eye. While on the other hand, the Phaneritic rocks are large in size and can be easily seen from the naked eye. How are phaneritic and aphanitic textures different? APHANITIC
What is the difference between a conduit and a vent on a volcano?
GeologyCrater – Mouth of a volcano – surrounds a volcanic vent. Conduit – An underground passage magma travels through. Throat – Entrance of a volcano. The part of the conduit that ejects lava and volcanic ash. What is a conduit in a volcano? Volcanic pipes or volcanic conduits are subterranean geological structures formed by the
What is the relationship between eons eras epochs and periods of the geologic time scale?
GeologyEons are the largest spans of time in the geologic time scale. Eons are divided into smaller units called eras. Eras are subdivided into periods. Periods are subdivided into even smaller time spans called epochs. What is the difference and relationships between eons eras periods and epochs? eon = The largest unit of time. era
What is the most famous Butte?
GeologyMonument Valley, in the U.S. states of Utah and Arizona, has the most famous collection of buttes in the world. The buttes of Monument Valley have been the setting for many movies and television series, from Forrest Gump to Easy Rider. There are no buttes nicknamed “the Socks,” but these are the Mittens. What is