SCIENCE 4TH

• Earthquake - it is the sudden movement or vibration of the crust.
• Faults - Are cracks in Earth's crust between two huge plates.
• The motion of the ground during an earthquake is measured by an instrument called a seismograph
• Volcanic Earthquake - Caused by the movement of magma inside a volcano.
• Tectonic Earthquake - Caused by the movement of the Earth's crust.
• Epicenter - The area on Earth's surface directly above the starting point of an earthquake.
• The Philippine Institute of Volcanology and Seismology - Monitors predicts, and determines areas that are prone to earthquakes, volcanic eruption, tsunamis etc.
• Intensity - Measures the strength of shaking produced by the earthquake at a certain location.
• Magnitude - Measure of earthquake size and remains unchanged with distance from the earthquake.
• Volcano - Is an opening in the Earth's crust.
• The opening of a volcano is called the crater.
• Active Volcanoes - Likely to erupt or showing signs of possible eruption.
• Dormant Volcanoes - Are those that have not erupted for thousands of years.
• Extinct Volcanoes - No written records of activity.
• Weather - Day to day conditions of a particular place.
• If the weather is the same for several days, meteorologists call this a weather pattern.
• Season - Refers to the weather conditions for a few months.
• Dry season - December to May

  Wet Season - June to November
• Climate - Long time weather condition of an area.
• Study of weather is called Meteorology, and the scientist who study the weather are called Meteorologists. They are commonly called weather man.
• Philippine Atmospheric Geophysical and Astronomical Service Administration - In charge of observing, recording and studying the weather.
• Northeast Monsoon - Often called amihan. December to February. Usually brings cold winds.
• Southwest Monsoon - Often called habagat. June to September. Produces abundant rain.
• Wet season - Characterized by heavy rainfall.
• Dry season - Filipinos usually experience very hot temperature.
• Type 1 - Two pronounced seasons.
• Type 2 - Pronounced rainy season, but no dry season
• Type 3 - No pronounced maximum rainy period. Short dry season, rainy days rest of the year.
• Type 4 - Even distribution of rainfall all year round.
• Rotation - Movement of the earth on its axis. Over 24 hours.
• Day and Night - Half of earth that faces the sun experiences day while the other half experiences night.
• Revolution - Movement of the earth around the sun. Last for 365 days and 6 hours for a full revolution.
• Summer solstice - Beginning of summer on June 21, also the longest day.
• Winter Solstice - Beginning of winter on December 21, also the shortest day.
• Spring Equinox - Beginning of spring on March 21.
• Autumn Equinox - Beginning of spring on September 22.
• Heliocentric - The sun is the center of the solar system.
• Geocentric - The earth is the center of the solar system.
• Nicolaus Copernicus proposed the Heliocentric model.
• Terrestrial Planets - Made up of rocks and metals.