How did water arrive on early Earth?

Scientists know that moon rocks have heavier chlorine than is typically found on Earth. What does this evidence support?

What is the first form of life on Earth?

Pictured is zircon. It has been dated to 4.4 billion years old. This is evidence for which event in Earth's history?

The early atmosphere did NOT have which gas?

How was the moon formed?

Why did heavy metals like iron and nickel get pushed to Earth's center during the formation of Earth's layers?

What had to exist on Earth before life could form?

What ends the Precambrian Supereon (the first 4 billion years of Earth's history)?

Which space rock is often called a shooting star?

Where are most asteroids found?

I am a large rock that revolves around the Sun

This is a broken piece of space rock that is still in space.

A rock that burns up in the Earth's atmosphere

What is a craton?

when heavy metals sink towards the center and lighter materials accumulate near the surface of a planet

Oldest and most stable part of a continent. Made up of the crust and upper mantle.

A large percentage of this element is found in the center of the Earth.

exposed rock in north america, very old, contains nickel, silver , gold and other valuable minerals

fragments of granite rich crust which formed during the Archean from volcanic activity

the ancient continent of north america

the collision of Laurentia and Amazonia made Earth's first supercontinent called

list the layers of the Earth from inside out

when microcontinents collided they formed

Blue-green algae (unicellular) thought to be one of the earliest forms of life on earth.

A giant landmass that formed at the end of the Paleozoic Era when the continents came together.

The tectonic processes and landforms of mountain building.

The early supercontinent that contained what is now North America is known as

Torrents of lava poured from a rift in Laurentia (ancient North America) over a thousand miles long. What do geologists think stopped the continent from splitting in two?

Which conditions necessary for life?

The early Earth's atmosphere lacks oxygen. True or False?

What are stromatolites? Select all that apply.

How do scientist think that early atmosphere was probably formed?

Where do scientist thing the water from the oceans came from?

True or False: The first organisms in the ocean did not use oxygen.

How did oxygen get in the atmosphere if there were no organisms to perform photosynthesis?

What layer of the atmosphere does oxygen help make up?

True or False: No animals would have been able to breathe in Earth's early atmosphere.

How long ago did the Great Oxygenation Event Occur?

What is rust formed by?

Rocks containing layers of iron oxide formed before oxygen was released into the atmosphere by living things.

Stromatolites are piles of cyanobacteria that have been secreting a lime substance and hardening over time so that they resemble rocks?

Iron oxide is also known as rust?

lightening and solar radiation provided enough energy to transform atmospheric chemicals into biomolecules, which then accumulated in the massive ocean covering the earth’s surface.

The Miller-Urey experiment of 1953 was designed to test the hypothesis that lightning supplied the energy needed to turn atmospheric gases into organic molecules such as amino acids. Which of the following describes why the Miller-Urey theory is widely accepted today?

What is the 'Snowball Earth' hypothesis?

Shape of a planet's orbit

All planets in this solar system orbit the Sun in the same direction.

If an ellipse is more linear (stretched), it has an eccentricity closer to

Eccentricity is dependent on the length of its

One of the focal points of Earth's elliptical orbit

Point on orbit where a planet is closest to the Sun