Many planets one earth K-T ex 50 $ 50 $ 50 $ 100 $ 100 $ 100 $ 200 $ Eleanor M. Savko Many planets one earth Geologic Time 5/28/2018 K-T ex 50 $ 50 $ 50 $ 100 $ 100 $ 100 $ 200 $ 200 $ 200 $ 250 $ 250 $ 250 $ 500 $ 500 $ 500 $
How much of the universe is composed of dark matter? Eleanor M. Savko 5/28/2018 How much of the universe is composed of dark matter?
Eleanor M. Savko 5/28/2018 26.8 %
Eleanor M. Savko 5/28/2018 Oceans formed??
3.5 BYA
In a sequence of rock strata, the oldest layer will lie below or underneath the youngest.
Law of superposition
Which Steno’s law?
Principle of crosscutting relations
Which rock type? Rock which is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change
Metamorphic rocks
______________form the core of modern continents
Cratons
Spans almost 90 percent of Earth’s history
Precambrian
Early supercontinent
Rodinia
During the early Paleozoic, animal forms were? Only flying insects Limited to swamps Dominated by large reptiles Most abundant on land Restricted to marine environments
e. Restricted to marine environments
The Cenozoic is best known as _______
Age of mammals
Deposits worldwide contain pieces of melted or crushed rocks blasted from impact site
EJECTA
glassy spheres (0.1 mm—2 mm) Found close and far from impact site
spherules
closer to impact site 2-3 cm in size More irregular shapes
tektites
fragments of broken up rock
breccia
Which are these particles?
Shocked quartz