Formation of the Solar System

Question 1

Scientists believe Earths oceans are salty from water running over ____.

Accepted Answer

rocks

Question 2

The ______ hypothesis states that the sun and planets formed at about the same time.

Accepted Answer

nebular

Question 3

3 oxygen atoms combined is called _____.

Accepted Answer

ozone

Question 4

The original atmosphere of the Earth consisted primarily of ______.

Accepted Answer

hydrogen and helium

Question 5

The outer planets are also called the _____ giants.

Accepted Answer

ice

Question 6

Pluto is now considered a _______.

Accepted Answer

dwarf planet

Question 7

Primary bodies that orbit the sun are called ______.

Accepted Answer

planets

Question 8

What blew away or burned off the lighter elements on the inner planets?

Accepted Answer

sun

Question 9

When do scientists think the solar nebula formed?

Accepted Answer

5 billion years ago

Question 10

When Earth first formed it was very _____.

Accepted Answer

hot

Question 11

Small bodies that formed planets in the early stages are called _____.

Accepted Answer

planetesimals

Question 12

Earth has ______ distinct layers.

Accepted Answer

3

Question 13

What is the difference between planets and protoplanets?

Accepted Answer

smaller and denser

Question 14

Planets, dwarf planets and other bodies that revolve around the sun are called _____.

Accepted Answer

solar system

Question 15

When heavier, denser material sinks, while lighter material rises this is called _____.

Accepted Answer

differentiation

Question 16

Early organisms, like ____, helped to create more oxygen in the atmosphere.

Accepted Answer

cyanobacteria

Question 17

When gases come out of the Earth, like in volcanic eruptions, its called _____.

Accepted Answer

outgassing

Question 18

The oceans help the atmosphere because it helps to dissolve ____.

Accepted Answer

carbon dioxide

Question 19

How long do scientists believe it rained on Earth to form the oceans?

Accepted Answer

10 million years

Question 20

Where do scientists believe water on Earth came from?

Accepted Answer

comets

Question 21

The first ocean was ______.

Accepted Answer

fresh water

Question 22

What elements are the inner planets made mostly of?

Accepted Answer

nickel and iron

Question 23

What percentage of matter from the solar nebula is the sun made from?

Accepted Answer

99%

Formation of the Solar System

Questions 23

Formation of the Solar System

Questions 23