The law of superposition finds the __________ age of rocks
relative
How do scientists know that some mountains were once at the bottom of an ocean?
Marine fossils have been found on the peaks of some mountain
Saltwater fish are found in some mountain streams.
Freshwater rivers flow to the ocean.
Dinosaur bones have been discovered in the mountains.
This law that states that older rocks are at the bottom and younger rocks are on top is called...
law of superposition
Which fossil is the youngest?
mammoth tusks
What do you call the supercontinent landmass formed million years ago?
Pangea
A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?
the birds living in the area of the bones
the index fossils in the area of the bones
the weather conditions in the area of the bones
the kinds of trees living in the area of the bones
Scientists find dinosaur fossils in the bottom rock layers of a cliff and mammal fossils in the middle rock layer of the cliff. Which could best be concluded from this evidence?
Dinosaurs were eaten by the mammals.
Dinosaurs ate plants.
Dinosaurs lived on Earth before the mammals
Dinosaurs and mammals lived at the same time.
Which rock layer is the oldest?
B
What type of rock are you most likely to find fossils in?
Sedimentary Rock
Which is the most accurate method scientists use to predict the age of Earth?
relative dating of rock layers
comparing the ages of different fossils
radioactive dating of rocks
investigating core samples from the Arctic.
True or False Tectonic plates are constantly moving at different rates and in different directions.
True
Fossils that help determine the relative age of rocks around it are called
index fossil
Which allows scientists to investigate what Earth’s climate was like over the past 740,000 years?
ice cores
fossild
volcanic deposits
faults
What do earthquakes tell scientists about the history of the planet?
The oceans are much deeper today than millions years ago.
Dinosaurs became extinct about 65 million years ago.
The continents of Earth are continually moving
Earth’s climate is constantly changing
How old is the Earth?
4.6 Billion years
Which best describes how ice cores are important to the study of geologic history?
They contain evidence showing changes in the atmosphere
They hold index fossils, which date the different ice cores
They show unconformities, which signal changes in deposition
To learn how Earth’s Atmosphere has changed over time, scientists study air bubbles in what?
ice cores
What drives the process of plate tectonics?
Heat of the Earth, convection currents
What is A called?
an intrusion
type of rock formed through the cooling and solidification of magma or lava.
igneous