Scientists classify Earth's layers according to their composition and physical behavior. Which   set correctly identifies the four main compositional layers of Earth?

Astronomers observe a bright streak of light when a space rock enters Earth's atmosphere. What is this phenomenon called?

Different space technologies are designed to perform specific tasks in exploring the universe. Which instrument collects light or other electromagnetic radiation to observe distant celestial objects?

A celestial object orbits the Sun and is nearly round, but it has not cleared other objects from its orbital neighborhood. How should scientists classify it?

A comet develops a glowing coma and tail as it approaches the Sun. Which explanation best describes why this happens?

Artificial satellites collect information about rainfall, clouds, and atmospheric conditions across large areas of Earth. How does this information help communities prepare for natural hazards?

A learner is constructing a scale drawing of Earth's interior using the scale 1 cm = 100 km. The mantle has an approximate actual thickness of 2,900 km. How thick should the mantle appear in the drawing?

A student examines a small, irregular, rocky object orbiting the Sun between Mars and Jupiter. Which classification should the student use?

A science class uses NASA information to investigate why the Perseids usually peak in August. Which piece of information should the learners apply to explain this recurring event?

A learner wants to investigate the usual peak months and associated objects of meteor showers. Which approach would best help the learner gather reliable secondary information?

A research mission needs to examine the rocks and soil on Mars without sending human explorers to the planet. Which technology is most appropriate for investigating the surface directly?

The Global Precipitation Measurement Core Observatory collects information about rainfall and snowfall around the world. Which investigation would benefit most directly from its data?

Two learners compare the lithosphere and asthenosphere while explaining how tectonic plates move.  Which analysis correctly distinguishes these two mechanical layers?

Scientists observe that Earth's outer core is liquid, while its inner core remains solid despite extremely high temperatures. Which explanation best analyzes the difference in their physical states?

Two celestial objects are observed: Object X is rocky and metallic, while Object Y contains ice, dust, and rock and develops a tail near the Sun. Which conclusion correctly differentiates them?

Scientists compare a meteoroid traveling through space with a meteorite recovered from Earth's surface. Which analysis correctly explains their relationship?

Astronomers compare the Perseids in August, the Orionids in October, and the Geminids in December. Which pattern best explains their different peak months?

A student finds that the Perseids occur regularly in August, but fewer meteors are visible during one observation than during another year. Which analysis best explains this difference?

Curiosity examines Martian rocks and soil, while OSIRIS-REx returned material from asteroid Bennu for laboratory analysis. What does comparing these missions reveal about scientific investigation?

Space probes have provided close-up observations of Pluto, while asteroid sample-return missions have delivered extraterrestrial material for laboratory testing. Why is combining these forms of evidence valuable?