Poem about heat and energy and temperature

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade

In what three areas is the us leader?

What evidence supports geological processes changing the surface of the earth? cutting down forests creates a decrease of habitats. tectonic plates uplift the rocky crust of earth to form mountains. competition in ecosystems creates a decrease in diversity. pollution runoff contaminates a lake.