Pressure builds under the surface of the volcano pushing molten material upwards. At the same time, heat increases from the Earth's interior, flows upward and heats the rock of the volcano. When the temperature and pressure are just right, the rocks melt to form magma which moves toward the surface. When the magma breaches the surface it can erupt violently or non violently depending on what rock was melted and the amount of pressure. The magma is now called lava and will cool into igneous rock. Igneous rocks are classified according to where they are formed Intrusive Rock Extrusive Rock Basaltic Rock Granitic Rock Andesitic Rock Rock that forms below the surface. Characteristic: has large crystals Rock that forms at or just below Earth's surface.
Ways to Keep from Falling Sleep. Â» The simplest way to stay completely alert and feel energetic throughout the day to is get 7 to 9 hours of sleep at night. But if you still have the tendency to fall asleep at odd hours of the day, then try the following tips. Â» If you are looking for the easiest way to stay alert during the afternoons, then drink a glass of cold water. It would simply refresh your body and mind by helping your body to get rid of toxins.
Polysomnography monitors your sleep stages and cycles to identify if or when your sleep patterns are disrupted and why. The normal process of falling asleep begins with a sleep stage called non-rapid eye movement (NREM) sleep. During this stage, your brain waves, as recorded by electroencephalography (EEG), slow down considerably. Your eyes don't move back and forth rapidly during NREM, in contrast to later stages of sleep. After an hour or two of NREM sleep, your brain activity picks up again, and rapid eye movement (REM) sleep begins. Most dreaming occurs during REM sleep. You normally go through four to six sleep cycles a night, cycling between NREM and REM sleep in about 90 minutes.