Earth's Evolution Through Geologic Time Part 1

What are the two main factors that make Earth unique and able to support life?

• Liquid water and oxygen-rich atmosphere

• Plate tectonics and a molten metallic core

• The right size and the right location

• The right time and the right location

What would happen if Earth were 10 percent closer to the Sun?

• It would be too hot for liquid water and have an atmosphere like Venus

• It would be too cold for liquid water

• It would have a larger star with a shorter life span

• It would have a smaller star with a longer life span

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When did primitive photosynthetic organisms add oxygen to Earth's atmosphere?

• 2.5 billion years ago

• 65 million years ago

• 13.7 billion years ago

• 1.9 billion years ago

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What event wiped out the non-avian dinosaurs and opened new habitats for mammals?

• Mass extinction caused by an asteroid

• Formation of the Moon

• The Great Oxygenation Event

• The Big Bang

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What is the process by which heavier elements are formed in stars?

• Nuclear fusion

• Supernova event

• Accretion

• Volcanic outgassing

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What is a solar nebula?

• A rotating cloud of interstellar dust and gases

• A protosun formed from condensed material

• A flattened disk rotating around the protosun

• A collision of a Mars-sized object with Earth

What is the name of the Mars-sized object that collided with Earth to form the Moon?

• Thea

• Pangaea

• Rodinia

• Gondwana

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What caused Earth's temperature to increase during its early evolution?

• Repeated collisions with planetesimals and the decay of radioactive elements

• Formation of the Moon

• The Great Oxygenation Event

• Nuclear fusion in the cores of stars

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What is the name of the period when Earth was covered in a magma ocean?

• Hadean

• Archean

• Proterozoic

• Precambrian

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What gases were present in Earth's primitive atmosphere?

• Hydrogen, helium, methane, ammonia, carbon dioxide, and water vapor

• Oxygen, nitrogen, carbon dioxide, and water vapor

• Oxygen, nitrogen, and carbon dioxide

• Hydrogen, helium, and oxygen

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