Answer:
c. are renewable
Explanation:
There are many energy sources that the humans have learned to use and exploit. Some resources are non-renewable, while some a re renewable. The non-renewable tend to be cheaper for the time being, and they also tend to produce more energy, but the problem is that the reserves will eventually run out. On the other side, the renewable resources are constantly out there, and they can not be spent, which gives them the advantage on the long run.
The alternative energy sources have been more and more in the focus, especially when it comes to the more developed nations. The main reasons for this are that the fossil fuels will eventually run out, and that they are more environment friendly. This has led to development of technology that is able to harvest energy from the sun, water, and wind, all which are natural resources that are constantly present and can not be spent. Some nations have invested so much in these resources that they have gradually started to replace the fossil fuels, with the end goal being stopping the usage of the fossil fuels totally.
Answer:
The answer is B. earthquake
Explanation:
Answer:
approximately 5.1 million years ago
Explanation:
Jupiter has more mass than all other planets in the solar system combined. It helps protect Earth by steering comets either towards the sun or ejecting them to the outer reaches of the solar system or beyond. Jupiter has dozens of moons orbiting it, one of which, Europa, is thought to have a sub-surface liquid salt water ocean. It therefore may possibly harbor life as heat and water, the two ingredients required for life on Earth as we know it, are seemingly present below the moon’s surface.
Saturn has intrigued man for centuries, especially since the invention of the telescope when the Saturn’s grand rings were observed for the first time. Much like Jupiter, Saturn has many dozens of moons, one of which, Enceladus, could provide a foot-hold for life to form. Observations by the Cassini spacecraft revealed Enceladus’ to have tenuous geyser and therefore heated liquid must be lurking below the surface. Water and energy are essential to all forms of life on Earth and these two constituents are what scientists treasure most in the search for life beyond our planet.
Uranus - Over the 2006–2016 timeframe, there are no strategic missions planned to Uranus and only one spacecraft, the extremely productive Voyager II, has ever visited the distant planet. Ultimately, deep-entry probes into Uranus will be necessary in order to understand its composition and compare it to that of the other “water giant,” Neptune. Neptune poses a number of important questions regarding how giant planets form and what truncates the formation of multiple giant planets in a planetary system. Residing on the edge of our planetary system, Neptune may hold, deep in its interior, chemical clues concerning the nature of the rocky and icy debris that formed the giant planets. A comprehensive study of Neptune, and its moon Triton, is considered a priority for the third decade by the Solar System Exploration roadmap team.
Pluto was redefined in 2006 by the International Astronomical Union (IAU) as a “dwarf Planet.” Throughout the scientific community there is still much debate about this definition and many organizations have yet to weigh in. Pluto shares a region of its orbit with a collection of similar icy bodies called Kuiper Belt Objects (KBO’s). The Kuiper Belt is believed to represent the best available record of the original interstellar materials that formed the solar nebula. This region is also the birthplace of the short-period comets. Pluto’s orbit also crosses inside that of Neptune’s which renders Pluto a member of the Trans-Neptunian Object (TNO) class. Pluto’s moon, Charon, was discovered in 1978, but more recently in 2005, two moonlets, Nix and Hydra were revealed in telescopic surveys. The Pluto System is unique and the New Horizons mission will be the first spacecraft to glimpse these distant icy bodies when it encounters the system in 2015. Hope This Helps!!
