Geologic Time

Question 1

oceans✔ fossilsthe atmosphere

Revolt · Accepted Answer

fossils

Question 2

✔ PrecambrianPaleozoicCenozoic

Revolt · Accepted Answer

Precambrian

Question 3

✔ 1 2 3 4

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1

Question 4

1 2 ✔ 3 4

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3

Question 5

How are eras and periods of the geologic time scale named?

Revolt · Accepted Answer

They are named for the places where geologists first described rocks or fossils from that time.

Question 6

before ✔ after during

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after

Question 7

From what material did the moon form?

Revolt · Accepted Answer

material from Earth

Question 8

Fill in the blanks to complete each statement about the age of Earth. According to scientific evidence, Earth is approximately 4.6 years old. Scientists used dating to determine Earth’s age.

Revolt · Accepted Answer

Part 1: billion; Part 2: radiometric

Question 9

Order these events from oldest (1) to most recent (4). Dense melted material sank to form the core. Earth’s gravity captured gases to form the first atmosphere. Dust, rock, and ice were pulled together by gravity. Less dense material cooled, hardened, and formed the crust.

Revolt · Accepted Answer

2; Dense melted material sank to form the core.: 2; Earth’s gravity captured gases to form the first atmosphere.: 4; Dust, rock, and ice were pulled together by gravity.: 1; Less dense material cooled, hardened, and formed the crust.: 3

Question 10

Use the drop-down menus to match each description to the geologic era it describes. The first birds and flowering plants appeared during this era. This is also when the most well-known dinosaurs lived. Mammals, including humans, emerged during this era. At the beginning of this era, animals lived only in water. By the end, some early dinosaurs emerged.

Revolt · Accepted Answer

Mesozoic; Selection 1: Mesozoic; Selection 2: Cenozoic; Selection 3: Paleozoic

Geologic Time Answers

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