Unit 2 Earth Science

Front

What is Alfred Wegener's hypothesis of continental drift?

Back

A theory that continents have moved over geological time and were once joined together.

Front

How does evidence support the theory of plate tectonics?

Back

Evidence over the years has filled in the gaps in the continental drift hypothesis.

Front

What is the difference between a parent atom and a daughter atom in radioactive decay?

Back

A parent atom is the original radioactive atom, while a daughter atom is the product of its decay.

Front

If a rock sample has 25% of the parent atom remaining, how much of the daughter atom has formed?

Back

75% of the daughter atom has formed.

Front

What layer of the Earth is referred to as the asthenosphere?

Back

The semi-fluid layer beneath the lithosphere that allows for tectonic plate movement.

Front

What is convection in the context of heat transfer?

Back

The process where heat causes materials to rise and fall, creating a cycle.

Front

What are independent variables in scientific experiments?

Back

Variables that the scientist changes or controls.

Front

What is the lithosphere?

Back

The rigid outer layer of the Earth, consisting of the crust and upper mantle.

Front

What is the mantle?

Back

The layer of the Earth between the crust and the outer core, composed of semi-solid rock.

Front

What is the outer core?

Back

The liquid layer of the Earth's core, composed mainly of iron and nickel.