Earth's Vital Statistics

Question 1

1) The closest estimation of Earth’s age?
a) 4.5 billion years old
b) 3.5 billion years old

Answer 1

A. 4.5 billion years is the closest estimation of Earth’s age.

Question 2

2) Is NOT true about the Earth’s Geosphere?
a) It is the largest out of all Earth’s “spheres”
b) It is composed only of the external processes that we can observe on the surface.

Answer 2

B. Geosphere is composed not only of external processes that we can observe on
the Earth’s surface but also of internal processes that happen deep within the Earth’s surface.

Question 3

3) This “sphere” covers about 71% of the Earth’s surface.
a) Biosphere
b) Hydrosphere

Answer 3

B. Hydrosphere covers about 71% of the Earth’s surface

Question 4

4) A large portion of water in the Hydrosphere is composed of __________ water found in oceans.
a) Alkaline
b) Saline

Answer 4

B. saline or saltwater from

oceans 97.4% of the Earth’s Hydrosphere is composed

Question 5

5) This “sphere” is the band of Earth’s surface where biological life resides.
a) Biosphere
b) Geosphere

Answer 5

A. The Biosphere refers to the band of Earth where living things reside. Take note of
the word “Bio” in Biosphere which refers to life (Bio means life)

Question 6

6) What are the four major spheres on Earth?
a) Atmosphere, Hydrosphere, Biosphere, Geosphere
b) Hydrosphere, Geosphere, Stratosphere, Atmosphere

Answer 6

A. Atmosphere, Hydrosphere, Biosphere, Geosphere consist of the four major spheres.

Question 7

7) _________ can be thought of as the interface of the four spheres.
It is made up of weathered or broken down rock (geosphere),
organic matter or humus (biosphere),
moisture (hydrosphere), and
air (atmosphere).
a) sun
b) soil

Answer 7

B. soil can be thought of as the interface of the four spheres.

Question 8

8) ______ is a collective layer of gas that envelopes the Earth
a) Atmosphere
b) Biosphere

Answer 8

A. Atmosphere shields the Earth and its inhabitants from harmful ultraviolet (UV) radiation from the Sun, maintains the warmth of the Earth’s surface, contains all of the essential gasses needed to support life.

Question 9

9) The ______ is the largest out of all the spheres
a) Atmosphere
b) Geosphere

Answer 9

B. Geosphere

Question 10

10) There are three major spheres
a) True
b) False

Answer 10

b) False