Enviro final 2022-2023

The largest expanse of tim on the geologic time scale is the...

• year

• epoch

• era

• period

Which of the following is an example of human impact on climate changes?

• the greenhouse effect

• changes in solar output

• global warming

• changes in the tilt of the Earth's axis

What type of boundary occurs where two plates move together, causing one plate to descend into the mantle beneath the other plate?

• transform fault boundary

• divergent boundary

• convergent boundary

• transitional boundary

What is the major source of free oxygen in the atmosphere?

• molten rock

• water

• green plants

• silicate minerals

The thermal convection that drives plate motion is caused by ...

• seafloor spreading

• an unequal distribution of heat

• gravity

• subduction

Which of the following is not one of the three types of rock?

• igneous

• magma

• sedimentary

• metamorphic

Earthquakes are usually associated with

• violent weather

• faults

• large cities

• the east coast of North America

How does the age of the seafloor sediments change with increasing distance from the ocean ridge?

• Age decreases

• Age stays the same

• Age increases

• Age varies without a pattern

In general, the law of superposition states that in an undeformed sequence of sedimentary rocks, each layer is

• basically the same age

• older than the one above it

• older than the one below it

• thicker than the one above it

The greenhouse gas carbon dioxide helps to

• deflect harmful radiation from space

• increase precipitation in arid areas

• form clouds in the atmosphere

• maintain warmth near Earth's surface