https://padlet.com/silverhippocampus/4cjli2ylzfai Made with the help of a Hesitant Alien en-us 2018-07-14 19:08:08 UTC 2018-07-15 00:08:46 UTC hello@padlet.com silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270203354 A) Relative dating: "a method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock" (taken from http://www.yourdictionary.com/relative-dating)
B) Radioactive (radiometric) dating: "any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product" (taken from http://www.dictionary.com/browse/radioactive-dating)]]> 2018-07-14 19:15:05 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270203354 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270204207 By using radiometric dating of rocks from Earth & space.
                                                        *the Earth is about 4.6 billion years old
(http://earthsky.org/earth/how-old-is-the-earth)]]> 2018-07-14 19:47:18 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270204207 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270204312 One of the most popular theories is that of water on comets. The theory is that, once Earth solidified & cooled down a little, comets crashed into Earth, carrying water. The water (as a solid on the asteroid) melted & became liquid.
(https://www.smithsonianmag.com/science-nature/how-did-water-come-to-earth-72037248/)]]> 2018-07-14 19:50:31 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270204312 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270204335 2018-07-14 19:51:25 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270204335 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270205191 A) fossil records (ex: when fossils of ocean-dwelling creatures are found on dry land)
B) when plant & animals in different parts of the Earth have the same ancestor(s)
C) plate tectonics
(https://prezi.com/lozppykdoumr/how-do-scientists-know/]]> 2018-07-14 20:33:06 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270205191 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270205543 Measuring sea level is a way to learn how the climate was. For example, if scientists can determine how high the ocean level was a couple million years ago, we can get an idea of whether the climate was warmer or colder.]]> 2018-07-14 20:52:05 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270205543 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270206225 The dating of fossils.
(https://prezi.com/lozppykdoumr/how-do-scientists-know/)]]> 2018-07-14 21:17:49 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270206225 silverhippocampus https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270208976 A) they have similar/the same ancestor(s)
B) they have similar/the same anatomy
(https://prezi.com/lozppykdoumr/how-do-scientists-know/)]]> 2018-07-14 23:42:54 UTC https://padlet.com/silverhippocampus/4cjli2ylzfai/wish/270208976