The planet on which we live; the world: “the diversity of life on earth”.
The earth is the third planet from the sun in the solar system, orbiting between Venus and Mars at an average distance of 90 million miles (149.6 million km) from the sun, and has one natural satellite, the moon. It has an equatorial diameter of 7,654 miles (12,756 km), an average density 5.5 times that of water, and is believed to have formed about 4,600 million years ago. The earth, which is three-quarters covered by oceans and has a dense atmosphere of nitrogen and oxygen, is the only planet known to support life
a branch of knowledge or study dealing with a body of facts or truthssystematically arranged and showing the operation of general laws:
The mathematical sciences.
Systematic knowledge of the physical or material world gained through observation and experimentation.
Any of the branches of natural or physical science.
Systematized knowledge in general.
Knowledge, as of facts or principles; knowledge gained by systematicstudy.
A particular branch of knowledge.
Skill, especially reflecting a precise application of facts or principles; proficiency.
Any of various sciences, as geography, geology, or meteorology, thatdeal with the earth, its composition, or any of its changing aspects.
The branch of science dealing with the physical constitution of the earth and its atmosphere.
Any of several essentially geologic sciences that are concerned with the origin, structure, and physical phenomena of the earth.
Earth Science is made of many branches of knowledge of all aspects of the Earth system. The main branches are geology, meteorology, climatology, oceanography and environmental science. Astronomy uses principles understood from earth to learn about the solar system,