Formation of Earth and Life

Outgassing refers to

• changes in the total amount of water on Earth through evapotranspiration.

• a steady-state equilibrium in the water system caused by cycles of evaporation and condensation.

• the dynamic equilibrium between surface and ocean water.

• the process in which water and water vapor emerge from deep layers within and below the Earth's crust.

Which two theories are most accepted for explaining the formation of Earth's oceans?

• Comets and Volcanism
• Volcanism and Continental Drift
• Comets and Continental Drift
• Volcanism and Convection Currents

The process by which matter became layered according to density during the earth's formation, with heavier matter near the core and lighter material closer to the crust is called...

• transplantation

• density stratification

• accretion

• magic

According to scientists, the Earth was formed...

• 46 billion years ago

• 4.6 billion years ago

• 46 million years ago

• 4.6 million years ago

How do scientists think Earth's core was formed?

• Heavy metals sunk into the Earth's surface

• Heavy metals rose to the top of Earth's surface

• Light metals sunk into the Earth's surface

• Light metals rose to the top of Earth's surface

How do scientists think the moon formed?

• Something crashed into Earth and broke apart, part of it became the moon

• A piece of Earth broke off and became the moon

• A star burned out and became the moon

• Something crashed into the sun and broke apart, part of it became the moon

How has Earth changed since the ocean formed?

• Plants added oxygen to the ocean

• The ocean has been continuously warming

• Plants added carbon dioxide to the atmosphere

• The ocean has been continuously cooling

What is biosynthesis?

• The formation of life

• The formation of layers

• Process by which atoms emit energy

• volcanic venting

Which of the following is NOT evidence that supports when life on Earth formed?

• oxygen found in rocks

• radiation contained in rocks

• fossils

• carbon residue found in rocks

How do scientists think the ocean formed?

• rain, created by Earth's cooling atmosphere, and icy comets

• something crashed into Earth, releasing water from the core

• from the accretion of cold particles

• heavier metals sinking into the core, water rising to the surface