compass.pptx
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scholars to the ancient theory that the compass was invented in Italy in about the year I 300. The theory, it is true, has suffered certain modifications, and there is now no question of invention at that date. The purpose of a compass is to put it simply, the compass is a tool which points out directions, such as North, South, East and West. These are also known as the cardinal directions. In more detail, it's a magnetised piece of metal that will turn towards the Earth's magnetic north pole. The most common form is the pocket compass. Compasses made it possible for explorers to sail far out into oceans and away from land—no matter what the weather was like. This led to more exploration, the discovery of new countries, and trade with other cultures.
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Unit1 160131210057
1. The document discusses the structure and content of a unit on planet Earth and its representation. It will cover topics like the shape and movements of the Earth, coordinates, maps, and time zones.
2. Key concepts that will be explained include the rotation and revolution of the Earth, latitude and longitude, map projections that represent the spherical Earth on a flat surface, and different types of maps and scales.
3. Questions to be answered relate to the position of Earth in the solar system, its movements and seasons, geographic coordinates, representations of Earth, and defining features of maps like scale and time zones. Useful vocabulary is also provided.
The seafloor spreading
Scientists used new techniques like sonar and submersibles in the 1950s-1960s to better observe the ocean floor. They discovered mid-ocean ridges and the theory of seafloor spreading, where new crust forms at ridges and pushes plates apart over time. The movement of plates causes the splitting of continents and creation of oceans. Magnetic patterns in ocean crust provided evidence that seafloor spreading occurs and plates have moved over millions of years.
Chapter 1
Chapter 1 of the History of Astronomy discusses prehistoric astronomy and early astronomical observations. It describes how early civilizations noticed the motions of the Sun, Moon, planets and stars and used them for timekeeping. It then discusses the development of models of the solar system from ancient Greek astronomers like Aristotle, Ptolemy and Copernicus to Renaissance scientists like Brahe, Kepler and Galileo. Key developments included determining the Earth and Moon's sizes, the heliocentric model of the solar system, and Kepler's laws of planetary motion. The growth of astrophysics in the 18th-19th centuries led to new discoveries and technologies.
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compass.pptx
- 1. C O M P A S S BY: Rellvienne Pearl C. Requinton
- 2. A compass is a device that indicates direction. It is one of the most important instruments for navigation.
- 3. A compass is a device that indicates direction. It is one of the most important instruments for navigation. What is Compass is used for?
- 4. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.
- 5. M A G N E T I C C O M P A S S
- 7. Magnetic compasses are the most well known type of compass. They have become so popular that the term “compass” almost always refers a magnetic compass. While the design and construction of this type of compass has changed significantly over the centuries, the concept of how it works has remained the same.
- 8. Magnetic compasses consist of a magnetized needle that is allowed to rotate so it lines up with Earth's magnetic field. The ends point to what are known as magnetic north and magnetic south.
- 9. Scientists and historians don’t know when the principles behind magnetic compasses were discovered. Ancient Greeks understood magnetism.
- 10. As early as 2,000 years ago, Chinese scientists may have known that rubbing an iron bar (such as a needle) with a naturally occurring magnet, called a lodestone, would temporarily magnetize the needle so that it would point north and south.
- 11. Very early compasses were made of a magnetized needle attached to a piece of wood or cork that floated freely in a dish of water. As the needle would settle, the marked end would point toward magnetic north.