Science ConcepTest

Which layer of Earth is responsible for generating its magnetic field?

• Crust

• Mantle

• Outer core

• Inner core

Which of the following best explains why we only see one side of the Moon from Earth?

• The Moon doesn't rotate

• The Moon's orbit is elliptical

• The Moon rotates at the same rate it revolves around Earth

• The Moon is always illuminated on one side

What causes Earth's seasons?

• Distance from the Sun

• Earth's elliptical orbit

• Earth's axial tilt

• The Moon's gravitational pull

Which of the following statements about plate tectonics is true?

• Oceanic crust is older than continental crust

• Plates move due to magnetic fields

• Subduction occurs when denser plates sink beneath lighter ones

• Plates only move horizontally

A light-year is a unit of:

• Time

• Speed

• Distance

• Luminosity

What evidence supports the Big Bang theory?

• Tectonic plate movement

• Moon phases

• Cosmic microwave background radiation

• Uniform surface temperature of planets

Which process forms sedimentary rocks?

• Melting

• Evaporation

• Weathering, erosion, deposition, and compaction

• Crystallization from magma

What is the primary reason the Sun appears brighter than other stars?

• It's larger than all other stars

• It emits more energy

• It's closer to Earth than other stars

• It's a white dwarf

Which organelle is the site of cellular respiration?

• Ribosome

• Chloroplast

• Mitochondrion

• Nucleus

Which process produces genetic variation in sexually reproducing organisms?

• Mitosis

• Binary fission

• Crossing over during meiosis

• DNA replication