Chapter 22 Precambrian Earth

Question 1

Glacial event that occurred between 700 and 800 million years ago is _____.

Accepted Answer

Varangian glaciation

Question 2

Hot water vent at volcanic seafloor rift is _____.

Accepted Answer

hydrothermal vent

Question 3

The process by which volcanoes vent water vapor, carbon dioxide, nitrogen, and other substances is called ____.

Accepted Answer

outgassing

Question 4

Ancient continent that contained core of modern-day North America is called ______.

Accepted Answer

Laurentia

Question 5

Mat or mound composed of billions of cyanobacteria are known as stromatolite.

Accepted Answer

True

Question 6

Building blocks of proteins are known as amino acids

Accepted Answer

True

Question 7

The buried and exposed parts of a continental shield together compose the _________, the stable core of a continent.

Accepted Answer

craton

Question 8

Earth’s oceans formed as basalt-floored basins slowly filled with rain.

Accepted Answer

True

Question 9

Meteor that has fallen to Earth

Accepted Answer

meteorite

Question 10

The ozone layer that filters ultraviolet radiation originated from ____ produced by stromatolites.

Accepted Answer

oxygen

Question 11

The oldest known mineral on Earth is ____.

Accepted Answer

zircon

Question 12

How old is the Earth estimated to be?

Accepted Answer

4.6 billion years old

Question 13

An organism composed of a single cell that does not contain a nucleus and is the simplest kind of cell is a(n) ____.

Accepted Answer

prokaryote

Question 14

Cyanobacteria use the process of ____ to produce energy, and oxygen is given off as a waste product.

Accepted Answer

photosynthesis

Questions 14