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