| Since that time, some additional work has been done on veblens, and we understand them a little better. As I said, they are hills of sand or gravel that were deposited by relatively forceful upward flows of groundwater. The upward water flows had to have been with sufficient force to transport fairly coarse materials, in some cases rocks up to 3 or 4 inches in diameter. The only other geologic features that might be mistaken for veblens are glacial hills known as kames. However, kames consist of gravel and sand deposited by streams that flowed into holes in the glacial ice, depositing sediment in the holes.
A large problem that comes with earthquakes is landslides. A landslide is a geological phenomenon which includes a wide range of ground movement, such as rockfalls, deep failure of slopes and shallow debris flows. A landslide can occur in offshore, coastal and onshore environments. Along with landslides, earthquakes can cause fires by damaging electrical power or gas lines. In the event of water mains rupturing and a loss of pressure, it may also become difficult to stop the spread of a fire once it has started.
At constructive boundaries where plates are moving apart from one another, basaltic lava is erupted between the gaps. This type of lava is not very viscous due to its low silica content. This is because no subduction of crust is involved so the lava is not made of melted lithosphere but has risen from the mantle itself. The low viscosity of this lava causes it to flow very far before cooling and solidifying. This forms shield volcanoes with very gentle slopes and a much wider base than more conical shaped volcanoes involved with convergent plate margins.
It is the viscosity of magma that largely determines the nature and power of an eruption and the resultant severity of the hazard. Basic magma has a high proportion of dissolved gases and low silica content, making it very fluid. On the other hand, acidic magma is very rich in silica and has a relatively lower temperature, making it very thick and slow moving. The more viscous the magma, the greater the potential for explosive eruptions and these represent the greatest potential hazards. Non-explosive eruptions tend to produce mostly lava flows, which do not represent a particularly serious hazard to people, however they will destroy farmland and buildings.
When there is rain the forests holds a lot of rainfall to the soil through roots of plants. The water then sinks deeper in the ground and replenishes the supply of the water table. If there was the removal of these forests then water from rain would flow simply through the soil surface and not be retained. Another effect may be the water from rain will not stay in the soil at all and the process of evaporation would immediately set in therefore not replenishing water table. This would lead to wells drying up.
Wind is an important element responsible for erosion and deposition in all types of climates so long as sediment particles are loose and dry. When we think of strong winds it is not uncommon to associate them with other storms that usually carry some sort of precipitation with them. In these cases, such as rainstorms and hurricanes, it is more difficult for sediment to blow away due to the weight added from becoming wet. In dry climates, on the other hand, wind is an effective erosional agent. Since air is less dense than water wind can only remove fine sediment such as silt, sand, and clay, but unlike running water, wind is not confined to channels.
These do not flow out of the fractured target zones. Instead, they are left to keep the fractures open. Acidizing of the fluid also may have been done during preparation of the fluid. This is done by addition of hydrochloric acid and helps in cleaning the pores for the fluid to flow out well and the gas that will
Its relatively low temperature, high silica content and leads to blockages and powerful eruptions. This can mean that the eruptions caused by thick magma can be less frequent and more difficult to predict, meaning that when an eruption does occur, it is usually with little or no warning, which can lead to catastrophic consequences as any nearby settlement will be relatively unprepared for the effects of a violent volcanic eruption. Furthermore, acidic magma is more likely to produce
Based on your data, which type of soil do you think is best for agriculture? Explain your answer. Loam would be the best kind of soil to plant crops in because it is permeable but it takes low amounts of water to irrigate the soil. Farmers often have problems with soil erosion when they clear their fields after the growing season. Soil type is one factor that influences erosion.
Overstrand’s cliffs are made from deposits of glacial till from the last ice age. The cliffs of Overstrand are made from soft rocks. This makes them prone to slumping caused by sub-aerial process for example weathering and saturation of the rocks. This leads to major slumping such as the slumping at Clifton Way were 40 metres was lost in 1990. Bacton’s geology is comprised of clay, silts and sand.