10 free sample questions with answers and explanations. See how you'd score on the real CLEP exam.
What is the term for the remains or imprints of ancient plants and animals that are preserved in rock?
Explanation
Fossils is correct because they are the remains or imprints of ancient plants and animals that are preserved in rock, providing valuable information about the history of life on Earth.
What is the term for the process by which the Earth's plates move and change, resulting in the creation of mountains and volcanoes?
Explanation
Plate tectonics is the correct term, as it refers to the theory that the Earth's lithosphere is divided into plates that move and interact, resulting in geological phenomena such as mountain building and volcanic activity. This process involves the movement of the Earth's plates at their boundaries, where they converge, diverge, or slide past each other.
Which geologic principle states that older rocks are buried beneath younger rocks?
Explanation
Law of Superposition is correct because it states that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on the bottom, each layer being younger than the one beneath it and older than the one above it.
What era is characterized by the first appearance of life on Earth?
Explanation
The Precambrian era is characterized by the first appearance of life on Earth due to its time span, which encompasses the emergence of single-celled organisms and the development of early life forms. This era predates the formation of complex life forms, making it the correct time period for the origin of life on Earth.
What is the term for the point within the Earth where an earthquake occurs?
Explanation
Hypocenter is correct because it refers to the exact point within the Earth where the earthquake occurs, often deep beneath the surface.
What is the term for the wearing away of rock or soil by natural forces such as wind or water?
Explanation
Erosion is correct because it involves the removal and transportation of rock or soil by natural forces, resulting in the creation of new landforms.
What is the term for the movement of the Earth's crust that results in the creation of mountain ranges?
Explanation
Orogenesis is correct because it refers to the process of mountain building through the movement and deformation of the Earth's crust.
What process occurs at a plate boundary where two plates move apart?
Explanation
Divergence is correct because it involves the movement of two tectonic plates away from each other, resulting in the creation of new crust.
Which of the following best describes the composition of the Earth's mantle?
Explanation
Rocky material, including silicates is correct because the mantle is composed of hot, viscous rock that can flow over long periods of time, by applying the knowledge of plate tectonics and the Earth's composition.
What is the thinnest layer of the Earth?
Explanation
The crust is the thinnest layer of the Earth due to its relatively small thickness compared to the other layers, comprising only about 1% of the Earth's volume. This is because the crust is the outermost solid layer, sitting atop the more voluminous mantle.