https://padlet.com/303994/q0ess0c406h8 Made with a little mischief en-us 2018-01-16 21:46:03 UTC 2025-10-21 02:28:07 UTC hello@padlet.com 303994 https://padlet.com/303994/q0ess0c406h8/wish/221900288 The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.]]> 2018-01-16 21:48:20 UTC https://padlet.com/303994/q0ess0c406h8/wish/221900288 303994 https://padlet.com/303994/q0ess0c406h8/wish/221900903 The term rock strata refers to stacked-up layers of sedimentary rock. Other kinds of rocks can have layering in them, but the word strata is reserved for sedimentary rocks - rocks composed of individual fragments of minerals or other rocks.]]> 2018-01-16 21:50:36 UTC https://padlet.com/303994/q0ess0c406h8/wish/221900903 303994 https://padlet.com/303994/q0ess0c406h8/wish/221901445 the time taken for the radioactivity of a specified isotope to fall to half its original value.

• the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.

]]> 2018-01-16 21:52:45 UTC https://padlet.com/303994/q0ess0c406h8/wish/221901445 303994 https://padlet.com/303994/q0ess0c406h8/wish/221902389 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-16 21:55:55 UTC https://padlet.com/303994/q0ess0c406h8/wish/221902389 303994 https://padlet.com/303994/q0ess0c406h8/wish/221902798 The history of Earth concerns the development of planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past. ... Earth formed around 4.54 billion years ago by accretion from the solar nebula.]]> 2018-01-16 21:57:37 UTC https://padlet.com/303994/q0ess0c406h8/wish/221902798 303994 https://padlet.com/303994/q0ess0c406h8/wish/221903591 The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.]]> 2018-01-16 22:00:59 UTC https://padlet.com/303994/q0ess0c406h8/wish/221903591 303994 https://padlet.com/303994/q0ess0c406h8/wish/221904054 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-16 22:02:53 UTC https://padlet.com/303994/q0ess0c406h8/wish/221904054