11) Q12 What is the Earth's natural satellite called?
12) What is the study of plants called?
13) What is the most abundant gas in Earth's atmosphere?
14) What type of rocks are formed from cooling lava or magma?
15) What is the smallest unit of matter that retains all of its chemical properties?
16) How long does it take for light from the Sun to reach Earth?
17) Which planet is closest to the Sun?
18) What type of organisms are capable of using light as an energy source to make their own food?
19) What is the name of one of the two main types of cell division in which two identical cells are produced?
20) What is the name of the branch of science that deals with the physical properties and structure of Earth?