Big News About Old Rocks

What recent discovery did scientists make about the Grand Canyon's age?

• It is younger than previously thought

• It is exactly as old as previously thought

• It could be 10 times older than previously thought

• It has not changed in age estimates

What is the Grand Canyon primarily studied by?

• Biologists

• Geologists

• Historians

• Meteorologists

According to the text, what natural process primarily shapes the Grand Canyon?

• Volcanic activity

• Erosion

• Earthquakes

• Meteor impacts

How did the Grand Canyon begin to develop according to the new research mentioned?

• Through the movement of tectonic plates

• By the accumulation of sediment

• By the Colorado River digging deeper through erosion

• Due to a large meteorite impact

What evidence suggests that the Grand Canyon was formed from several smaller canyons?

• Discovery of ancient fossils

• Findings of varied chemical compositions in rocks

• Historical writings

• Satellite imagery analysis

How many years ago did the Colorado River begin to cut through Earth's crust according to the text?

• 4 million years ago

• 6 million years ago

• 10 million years ago

• 1 million years ago

What does the text suggest about the formation of the Grand Canyon?

• It was formed entirely by the Colorado River.

• It was formed by a series of small gorges joining together.

• It was formed due to volcanic activity.

• It was formed by meteor impacts.

According to the text, what is still uncertain about the Grand Canyon?

• Its age

• Its depth

• Its location

• Its length

What do most scientists agree on regarding the Grand Canyon's history?

• It is simple and well understood.

• It is not worth studying further.

• It has a complicated history.

• It is younger than previously thought.

Match the following words with their definitions.

• middle part of the Earth

• CORE

• part of the Earth we walk on

• MANTLE

• made of up iron and nickel; size of Mars

• CRUST

• contains thick liquid, plates move here

• ASTHENOSPHERE

• broken into tectonic plates

• LITHOSPHERE