Science test on Friday 10/10/14

Question 1

What is Earth mostly made of?

Answer 1

Rock

Question 2

What is the Earth’s surface mostly covered with?

Answer 2

Water

Question 3

What did planetesimals do as Earth formed?

Answer 3

crashed and combined

Question 4

What happened to Earth as gravity crushed at its center?

Answer 4

It became round

Question 5

What heated Earth as it formed?

Answer 5

radioactive material

Question 6

What happened as Earth heated up?

Answer 6

inner rocks melted

Question 7

Thin outermost layer of Earth

Answer 7

crust

Question 8

Central part of Earth

Answer 8

core

Question 9

layer beneath the crust

Answer 9

mantle

Question 10

what makes up most of the Earth’s atmosphere today?

Answer 10

nitrogen and oxygen

Question 11

What might have made up Earth’s early atmosphere?

Answer 11

carbon dioxide and water vapor

Question 12

What probably changed Earth’s early atmosphere

Answer 12

volcanic gases

Question 13

What might have helped change part of the early atmosphere?

Answer 13

elements in comets

Question 14

How might water vapor have formed the first oceans?

Answer 14

It condensed

Question 15

What might have brought some water to the first ocean?

Answer 15

icy comets

Question 16

has lots of energy and can break apart molecules

Answer 16

ultraviolet radiation

Question 17

protects us from the rays of the sun

Answer 17

ozone layer

Question 18

may have started forming from molecules in Earth’s waters

Answer 18

life-forms

Question 19

a way organisms make food by using the sun’s energy

Answer 19

photosynthesis

Question 20

a gas that is added to air as organisms make food

Answer 20

oxygen

Question 21

a gas that is removed from air as organisms make food.

Answer 21

carbon dioxide

Question 22

what caused a global ocean to form when Earth cooled

Answer 22

rain