BMST - Basic Math and Science Earth's Geological Cycles Questions and Answers 4

Question 1

What drives the movement of tectonic plates according to the most widely accepted scientific explanation?

Accepted Answer

Convection currents in the mantle

Answer

Convection currents in the semi-molten mantle carry heat from Earth's interior and drag tectonic plates along with them.

Question 2

Which geological time scale unit is the longest?

Accepted Answer

Eon

Answer

An eon is the largest division of geological time; Earth's history is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic.

Question 3

What percentage of Earth's water is freshwater?

Accepted Answer

About 3%

Answer

Only about 3% of Earth's water is freshwater, and most of that is locked in glaciers and ice caps, leaving less than 1% accessible as liquid freshwater.

Question 4

What is the term for molten rock once it reaches Earth's surface through a volcanic eruption?

Accepted Answer

Lava

Answer

Magma is called lava once it erupts onto Earth's surface; the terms refer to the same material at different locations.

Question 5

Which rock type can be transformed into metamorphic rock through heat and pressure?

Accepted Answer

Any type of rock

Answer

Any pre-existing rock—igneous, sedimentary, or metamorphic—can be transformed into metamorphic rock when subjected to sufficient heat and pressure.

BMST - Basic Math and Science Test Practice Test

BMST - Basic Math and Science Test Practice Test

BMST - Basic Math and Science Earth's Geological Cycles Questions and Answers 4