1) Which planets are known as the terrestrial planets? a) Jupiter, Saturn, Uranus, Neptune b) Mercury, Venus, Earth, Mars c) Mercury, Earth, Jupiter, Mars 2) What are terrestrial planets mainly made of? a) Gas and ice b) Rock and metal c) Hydrogen and helium 3) Which of the following layers make up terrestrial planets? a) Core, mantle, and crust b) Crust, magma, and atmosphere c) Core, hydrogen, and helium 4) Which planet is closest to the Sun? a) Venus b) Mercury c) Earth 5) What is Mercury’s average distance from the Sun? a) 1 Astronomical Unit b) 0.39 Astronomical Units c) 0.93 Astronomical Units 6) What is an Astronomical Unit (AU)? a) The distance between Earth and the Moon b) A measure of planet size c) The average distance between the Sun and Earth (about 150 million km) 7) What is the diameter of Mercury? a) 4,879 km b) 6,371 km c) 12,742 km 8) Which planet has the most extreme temperature range in the solar system? a) Venus b) Mercury c) Earth 9) What is the daytime temperature on Mercury? a) 127°C b) 427°C c) 865°C 10) What is the nighttime temperature on Mercury? a) -184°C b) -50°C c) -273°C 11) What causes Venus to have such a high surface temperature? a) Its distance from the Sun b) Thick CO2 atmosphere c) Volcanic activity 12) What is the average surface temperature of Venus? a) 100°C b) 300°C c) 465°C 13) What makes Venus’s atmosphere toxic? a) Sulfuric acid and CO2 b) Oxygen and nitrogen c) Methane and ammonia 14) Why is Venus called “Earth’s twin”? a) Similar moons b) Similar mass and size c) Same temperature 15) What type of rotation does Earth have? a) Retrograde rotation b) Clockwise rotation c) Prograde rotation 16) What type of rotation does Venus have? a) Prograde rotation b) Retrograde rotation c) Polar rotation 17) Which planet has the slowest rotation period in the solar system? a) Mercury b) Venus c) Mars 18) What covers much of Venus’s surface? a) Ice caps b) Volcanoes and craters c) Oceans 19) What is Venus’s surface compared to? a) Inside an active volcano b) Moon’s surface c) Earth’s deserts 20) What is Mercury’s internal composition mainly made of? a) Massive iron core b) Thick layer of ice c) Gaseous hydrogen 21) What makes Earth capable of supporting life? a) Its thick atmosphere b) Liquid water and energy c) Distance from the Moon 22) Which gas in Earth’s atmosphere is essential for breathing? a) Carbon dioxide b) Oxygen c) Nitrogen 23) How does matter cycle on Earth? a) Only between water and air b) Between living things and environment c) Between rocks and space 24) What allows different organisms to live on Earth? a) Same climate everywhere b) Different ecosystems c) Lack of tectonic movement 25) What is unique about Earth’s surface compared to other planets? a) Completely covered with water b) Divided into tectonic plates c) Has no craters 26) What do tectonic plates on Earth cause? a) Movement of lands and oceans b) Freezing of water c) Volcanoes on the Moon 27) How many species are estimated to live on Earth today? a) Between 5 to 30 million b) About 1 million c) Around 50,000 28) What is Earth’s natural satellite? a) Mars b) The Moon c) The Sun 29) How strong is gravity on the Moon compared to Earth? a) Equal to Earth’s gravity b) Half of Earth’s gravity c) One-sixth of Earth’s gravity 30) What causes the same side of the Moon to always face Earth? a) It doesn’t rotate b) Rotation equals revolution c) Earth’s shadow blocks rotation 31) What is the Moon’s surface like? a) Covered with sand and water b) Cratered with solidified lava c) Smooth and icy 32) What is the daytime temperature on the Moon? a) 127°C b) 300°C c) 465°C 33) What is the nighttime temperature on the Moon? a) -273°C b) -173°C c) -100°C 34) How does Mars’ atmosphere compare to Earth’s? a) 100 times thinner b) Same density c) Mostly nitrogen 35) What color is Martian soil and why? a) Yellow, due to sulfur b) Orange-red, due to iron-rich dust c) White, due to frozen carbon dioxide 36) What covers the northern hemisphere of Mars? a) Lava flows b) Ice caps c) Sand dunes 37) What characterizes the southern hemisphere of Mars? a) Oceans b) Heavy craters c) Dense forests 38) What is the largest canyon system in the solar system found on? a) Earth b) Venus c) Mars 39) What is Mars’ atmosphere mostly made of? a) Oxygen b) Carbon dioxide c) Nitrogen 40) What happens to carbon dioxide at Mars’ poles during winter? a) It burns b) Freezes into a thin coating c) Turns into liquid 41) What happens to the frozen carbon dioxide at Mars’ poles in summer? a) It disappears b) It thickens c) It turns into water 42) What causes giant dust storms on Mars? a) Volcanic eruptions b) Strong winds c) Meteor impacts 43) What evidence suggests liquid water once existed on Mars? a) Ice deposits b) Surface features c) Current rivers 44) What did scientists suggest about liquid beneath Mars’ surface? a) Might flow up b) Completely frozen c) Turns into gas

Grade 6 Terrestrial Planets

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