A Cross Section of Earth Reveals a Layered Structure That

question 19

Multiple Choice

A cross section of Earth reveals a layered structure that has different thicknesses and densities. How do geologists know this?

• A) From drilling and digging down into the various layers.
• B) From observing the characteristics of lava and gas issuing from volcanic vents.
• C) From observing the transit times through the Earth of waves generated by large earthquakes.
• D) From comparisons with drill cores taken by robot spacecraft on Mars and Venus.

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Definitions:

Initiative Versus Guilt

A stage of Erik Erikson's theory of psychosocial development where children are challenged to assert control and power over the environment to develop a sense of purpose.

Erik Erikson

A developmental psychologist known for his theory on the psychosocial development of humans, describing how personality develops across eight stages throughout the lifespan.

Adult Rules

The set of expectations, principles, or guidelines considered appropriate or typical for individuals recognized as adults in a society.

Independent

Refers to the state of being free from outside control or support, capable of thinking or acting for oneself.